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[n]	P. A. McIntosh et al., “Preparations for Assembly of the International ERL Cryomodule at Daresbury Laboratory”, in Proc. PAC'09, Vancouver, Canada, May 2009, paper WE5PFP050, pp. 2113-2115. 

[n]	M. Bocciai et al., “The ANKA RF Cavities”, in Proc. EPAC'98, Stockholm, Sweden, Jun. 1998, paper TUP15C, pp. 1817-1819. 

[n]	B. Simon, R. Maier, and G. Wuestefeld, “Analysis of the Triple Bend Achromat as a Lattice for BESSY II”, in Proc. EPAC'88, Rome, Italy, Jun. 1988, pp. 875-878. 

[n]	J. Krall, M. Friedman, Y. Y. Lau, and V. Serlin, “Numerical and Experimental Studies of Particle Accelerators Powered by Modulated Intense Relativistic Electron Beams”, in Proc. PAC'89, Chicago, IL, USA, Mar. 1989, pp. 609-612. 

[n]	S. Matsuzaki, M. Nishida, K. Sakaue, M. Washio, and H. Iijima, “Study of Cs-Te Photocathode for RF Electron Gun”, in Proc. IPAC'15, Richmond, VA, USA, May 2015, pp. 1632-1634. doi:10.18429/JACoW-IPAC2015-TUPJE010

[n]	D. A. Herrup et al., “Time-Varying Sextupole Corrections During the Tevatron Ramp”, in Proc. PAC'89, Chicago, IL, USA, Mar. 1989, pp. 518-521. 

[n]	T. A. Mehlhorn and J. P. Quintenz, “PIC Simulations of an Achromatic Solenoidal Focusing System for LMF”, in Proc. PAC'89, Chicago, IL, USA, Mar. 1989, pp. 1014-1017. 

[n]	S. Ohsawa et al., “Progress of Electron Gun Systems for the e-/e+ Linac at KEK”, in Proc. LINAC'88, Williamsburg, VA, USA, Oct. 1988, paper WE3-50, pp. 434-436. 

[n]	C. S. Hwang, C. H. Chang, T. C. Fan, G. J. Hwang, F. U. Lin, and P. K. Tseng, “Results Analysis of Measurement of the Multipole Magnet with Hall Probe”, in Proc. EPAC'94, London, UK, Jun.-Jul. 1994, pp. 1244-1247. 

[n]	C. A. Frost, C. E. Crist, G. T. Leifeste, R. B. Miller, W. W. Reinstra, and S. L. Shope, “Magnetic Bending of Laser-Guided Electron Beams”, in Proc. PAC'85, Vancouver, Canada, May 1985, pp. 2754-2757. 

[n]	T. Adachi, Y. Kanai, Y. Mori, and H. Someya, “Possibility of Resonant Excitation of the JHF 3-GeV Synchrotron Magnets Using A Multi-Network”, in Proc. EPAC'98, Stockholm, Sweden, Jun. 1998, paper TUP24G, pp. 2053-2055. 

[n]	V. Tzoganis, O. Kamigaito, M. Kase, T. Nagatomo, T. Nakagawa, and C. P. Welsch, “Development of an Online Emittance Monitor for Low Energy Heavy Ion Beams”, in Proc. HIAT'15, Yokohama, Japan, Sep. 2015, paper WEPB24, pp. 250-252. 

[n]	N. Sakamoto et al., “Commissioning of a New Injector for the RIKEN RI-Beam Factory”, in Proc. LINAC'12, Tel Aviv, Israel, Sep. 2012, paper MO3A02, pp. 125-129. 

[n]	C. L. Bohn et al., “Physics Goals for the Planned Next Linear Collider Engineering Test Facility”, in Proc. PAC'01, Chicago, IL, USA, Jun. 2001, paper FPAH048, pp. 3783-3785. 

[n]	H. Kirschner, A. Jankowiak, T. Kamps, J. Kuehn, and M. A. H. Schmeisser, “Measuring the Spectral Response of Cs-K-Sb Photocathodes for BERLinPro”, in Proc. IPAC'17, Copenhagen, Denmark, May 2017, pp. 1378-1380. doi:10.18429/JACoW-IPAC2017-TUPAB028

[n]	K. Takayama, T. Adachi, W. Jiang, and H. Tsutsui, “Induction Sector Cyclotron for Cluster Ions”, in Proc. IPAC'11, San Sebastian, Spain, Sep. 2011, paper WEPS075, pp. 2679-2681. 

[n]	D. L. Cook, “Progress in Light Ion Fusion”, in Proc. PAC'91, San Francisco, CA, USA, May 1991, pp. 537-542. 

For LaTeX

%\cite{McIntosh:PAC09-WE5PFP050} \bibitem{McIntosh:PAC09-WE5PFP050} P. A. McIntosh \emph{et al.}, \textquotedblleft{Preparations for Assembly of the International ERL Cryomodule at Daresbury Laboratory}\textquotedblright, in \emph{Proc. PAC’09}, Vancouver, Canada, May 2009, paper WE5PFP050, pp. 2113--2115. %\cite{Bocciai:EPAC98-TUP15C} \bibitem{Bocciai:EPAC98-TUP15C} M. Bocciai \emph{et al.}, \textquotedblleft{The ANKA RF Cavities}\textquotedblright, in \emph{Proc. EPAC’98}, Stockholm, Sweden, Jun. 1998, paper TUP15C, pp. 1817--1819. %\cite{Simon:EPAC88} \bibitem{Simon:EPAC88} B. Simon, R. Maier, and G. Wuestefeld, \textquotedblleft{Analysis of the Triple Bend Achromat as a Lattice for BESSY II}\textquotedblright, in \emph{Proc. EPAC’88}, Rome, Italy, Jun. 1988, pp. 875--878. %\cite{Krall:PAC89} \bibitem{Krall:PAC89} J. Krall, M. Friedman, Y. Y. Lau, and V. Serlin, \textquotedblleft{Numerical and Experimental Studies of Particle Accelerators Powered by Modulated Intense Relativistic Electron Beams}\textquotedblright, in \emph{Proc. PAC’89}, Chicago, IL, USA, Mar. 1989, pp. 609--612. %\cite{Matsuzaki:IPAC15-TUPJE010} \bibitem{Matsuzaki:IPAC15-TUPJE010} S. Matsuzaki, M. Nishida, K. Sakaue, M. Washio, and H. Iijima, \textquotedblleft{Study of Cs-Te Photocathode for RF Electron Gun}\textquotedblright, in \emph{Proc. IPAC’15}, Richmond, VA, USA, May 2015, pp. 1632--1634. \doi{10.18429/JACoW-IPAC2015-TUPJE010} %\cite{Herrup:PAC89} \bibitem{Herrup:PAC89} D. A. Herrup \emph{et al.}, \textquotedblleft{Time-Varying Sextupole Corrections During the Tevatron Ramp}\textquotedblright, in \emph{Proc. PAC’89}, Chicago, IL, USA, Mar. 1989, pp. 518--521. %\cite{Mehlhorn:PAC89} \bibitem{Mehlhorn:PAC89} T. A. Mehlhorn and J. P. Quintenz, \textquotedblleft{PIC Simulations of an Achromatic Solenoidal Focusing System for LMF}\textquotedblright, in \emph{Proc. PAC’89}, Chicago, IL, USA, Mar. 1989, pp. 1014--1017. %\cite{Ohsawa:LINAC88-WE3-50} \bibitem{Ohsawa:LINAC88-WE3-50} S. Ohsawa \emph{et al.}, \textquotedblleft{Progress of Electron Gun Systems for the e-/e+ Linac at KEK}\textquotedblright, in \emph{Proc. LINAC’88}, Williamsburg, VA, USA, Oct. 1988, paper WE3--50, pp. 434--436. %\cite{Hwang:EPAC94} \bibitem{Hwang:EPAC94} C. S. Hwang, C. H. Chang, T. C. Fan, G. J. Hwang, F. U. Lin, and P. K. Tseng, \textquotedblleft{Results Analysis of Measurement of the Multipole Magnet with Hall Probe}\textquotedblright, in \emph{Proc. EPAC’94}, London, UK, Jun.-Jul. 1994, pp. 1244--1247. %\cite{Frost:PAC85} \bibitem{Frost:PAC85} C. A. Frost, C. E. Crist, G. T. Leifeste, R. B. Miller, W. W. Reinstra, and S. L. Shope, \textquotedblleft{Magnetic Bending of Laser-Guided Electron Beams}\textquotedblright, in \emph{Proc. PAC’85}, Vancouver, Canada, May 1985, pp. 2754--2757. %\cite{Adachi:EPAC98-TUP24G} \bibitem{Adachi:EPAC98-TUP24G} T. Adachi, Y. Kanai, Y. Mori, and H. Someya, \textquotedblleft{Possibility of Resonant Excitation of the JHF 3-GeV Synchrotron Magnets Using A Multi-Network}\textquotedblright, in \emph{Proc. EPAC’98}, Stockholm, Sweden, Jun. 1998, paper TUP24G, pp. 2053--2055. %\cite{Tzoganis:HIAT15-WEPB24} \bibitem{Tzoganis:HIAT15-WEPB24} V. Tzoganis, O. Kamigaito, M. Kase, T. Nagatomo, T. Nakagawa, and C. P. Welsch, \textquotedblleft{Development of an Online Emittance Monitor for Low Energy Heavy Ion Beams}\textquotedblright, in \emph{Proc. HIAT’15}, Yokohama, Japan, Sep. 2015, paper WEPB24, pp. 250--252. %\cite{Sakamoto:LINAC12-MO3A02} \bibitem{Sakamoto:LINAC12-MO3A02} N. Sakamoto \emph{et al.}, \textquotedblleft{Commissioning of a New Injector for the RIKEN RI-Beam Factory}\textquotedblright, in \emph{Proc. LINAC’12}, Tel Aviv, Israel, Sep. 2012, paper MO3A02, pp. 125--129. %\cite{Bohn:PAC01-FPAH048} \bibitem{Bohn:PAC01-FPAH048} C. L. Bohn \emph{et al.}, \textquotedblleft{Physics Goals for the Planned Next Linear Collider Engineering Test Facility}\textquotedblright, in \emph{Proc. PAC’01}, Chicago, IL, USA, Jun. 2001, paper FPAH048, pp. 3783--3785. %\cite{Kirschner:IPAC17-TUPAB028} \bibitem{Kirschner:IPAC17-TUPAB028} H. Kirschner, A. Jankowiak, T. Kamps, J. Kuehn, and M. A. H. Schmeisser, \textquotedblleft{Measuring the Spectral Response of Cs-K-Sb Photocathodes for BERLinPro}\textquotedblright, in \emph{Proc. IPAC’17}, Copenhagen, Denmark, May 2017, pp. 1378--1380. \doi{10.18429/JACoW-IPAC2017-TUPAB028} %\cite{Takayama:IPAC11-WEPS075} \bibitem{Takayama:IPAC11-WEPS075} K. Takayama, T. Adachi, W. Jiang, and H. Tsutsui, \textquotedblleft{Induction Sector Cyclotron for Cluster Ions}\textquotedblright, in \emph{Proc. IPAC’11}, San Sebastian, Spain, Sep. 2011, paper WEPS075, pp. 2679--2681. %\cite{Cook:PAC91} \bibitem{Cook:PAC91} D. L. Cook, \textquotedblleft{Progress in Light Ion Fusion}\textquotedblright, in \emph{Proc. PAC’91}, San Francisco, CA, USA, May 1991, pp. 537--542.

For BibTeX

@inproceedings{mcintosh:pac09-we5pfp050, author = {P. A. McIntosh and others}, title = {{Preparations for Assembly of the International ERL Cryomodule at Daresbury Laboratory}}, booktitle = {Proc. PAC'09}, pages = {2113--2115}, paper = {WE5PFP050}, venue = {Vancouver, Canada, May 2009}, series = {Particle Accelerator Conference}, number = {23}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/PAC2009/papers/WE5PFP050.pdf}, language = {english} } @inproceedings{bocciai:epac98-tup15c, author = {M. Bocciai and others}, title = {{The ANKA RF Cavities}}, booktitle = {Proc. EPAC'98}, pages = {1817--1819}, paper = {TUP15C}, venue = {Stockholm, Sweden}, series = {European Particle Accelerator Conference}, number = {6}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {8}, year = {1998}, url = {https://jacow.org/e98/papers/TUP15C.pdf}, language = {english} } @inproceedings{simon:epac88, author = {B. Simon and R. Maier and G. Wuestefeld}, title = {{Analysis of the Triple Bend Achromat as a Lattice for BESSY II}}, booktitle = {Proc. EPAC'88}, pages = {875--878}, paper = {}, venue = {Rome, Italy, Jun. 1988}, series = {European Particle Accelerator Conference}, number = {1}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{krall:pac89, author = {J. Krall and M. Friedman and Y. Y. Lau and V. Serlin}, title = {{Numerical and Experimental Studies of Particle Accelerators Powered by Modulated Intense Relativistic Electron Beams}}, booktitle = {Proc. PAC'89}, pages = {609--612}, paper = {}, venue = {Chicago, IL, USA, Mar. 1989}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{matsuzaki:ipac15-tupje010, author = {S. Matsuzaki and M. Nishida and K. Sakaue and M. Washio and H. Iijima}, title = {{Study of Cs-Te Photocathode for RF Electron Gun}}, booktitle = {Proc. IPAC'15}, pages = {1632--1634}, paper = {TUPJE010}, venue = {Richmond, VA, USA, May 2015}, publisher = {JACoW Publishing, Geneva, Switzerland}, doi = {10.18429/JACoW-IPAC2015-TUPJE010}, url = {https://jacow.org/IPAC2015/papers/TUPJE010.pdf}, language = {english} } @inproceedings{herrup:pac89, author = {D. A. Herrup and others}, title = {{Time-Varying Sextupole Corrections During the Tevatron Ramp}}, booktitle = {Proc. PAC'89}, pages = {518--521}, paper = {}, venue = {Chicago, IL, USA, Mar. 1989}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{mehlhorn:pac89, author = {T. A. Mehlhorn and J. P. Quintenz}, title = {{PIC Simulations of an Achromatic Solenoidal Focusing System for LMF}}, booktitle = {Proc. PAC'89}, pages = {1014--1017}, paper = {}, venue = {Chicago, IL, USA, Mar. 1989}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{ohsawa:linac88-we3-50, author = {S. Ohsawa and others}, title = {{Progress of Electron Gun Systems for the e-/e+ Linac at KEK}}, booktitle = {Proc. LINAC'88}, pages = {434--436}, paper = {WE3-50}, venue = {Williamsburg, VA, USA, Oct. 1988}, series = {Linear Accelerator Conference}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/l88/papers/WE3-50.pdf}, language = {english} } @inproceedings{hwang:epac94, author = {C. S. Hwang and C. H. Chang and T. C. Fan and G. J. Hwang and F. U. Lin and P. K. Tseng}, title = {{Results Analysis of Measurement of the Multipole Magnet with Hall Probe}}, booktitle = {Proc. EPAC'94}, pages = {1244--1247}, paper = {}, venue = {London, UK, Jun.-Jul. 1994}, series = {European Particle Accelerator Conference}, number = {4}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{frost:pac85, author = {C. A. Frost and C. E. Crist and G. T. Leifeste and R. B. Miller and W. W. Reinstra and S. L. Shope}, title = {{Magnetic Bending of Laser-Guided Electron Beams}}, booktitle = {Proc. PAC'85}, pages = {2754--2757}, paper = {}, venue = {Vancouver, Canada, May 1985}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{adachi:epac98-tup24g, author = {T. Adachi and Y. Kanai and Y. Mori and H. Someya}, title = {{Possibility of Resonant Excitation of the JHF 3-GeV Synchrotron Magnets Using A Multi-Network}}, booktitle = {Proc. EPAC'98}, pages = {2053--2055}, paper = {TUP24G}, venue = {Stockholm, Sweden}, series = {European Particle Accelerator Conference}, number = {6}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {8}, year = {1998}, url = {https://jacow.org/e98/papers/TUP24G.pdf}, language = {english} } @inproceedings{tzoganis:hiat15-wepb24, author = {V. Tzoganis and O. Kamigaito and M. Kase and T. Nagatomo and T. Nakagawa and C. P. Welsch}, title = {{Development of an Online Emittance Monitor for Low Energy Heavy Ion Beams}}, booktitle = {Proc. HIAT'15}, pages = {250--252}, paper = {WEPB24}, venue = {Yokohama, Japan, Sep. 2015}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/HIAT2015/papers/WEPB24.pdf}, language = {english} } @inproceedings{sakamoto:linac12-mo3a02, author = {N. Sakamoto and others}, title = {{Commissioning of a New Injector for the RIKEN RI-Beam Factory}}, booktitle = {Proc. LINAC'12}, pages = {125--129}, paper = {MO3A02}, venue = {Tel Aviv, Israel, Sep. 2012}, series = {Linear Accelerator Conference}, number = {26}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/LINAC2012/papers/MO3A02.pdf}, language = {english} } @inproceedings{bohn:pac01-fpah048, author = {C. L. Bohn and others}, title = {{Physics Goals for the Planned Next Linear Collider Engineering Test Facility}}, booktitle = {Proc. PAC'01}, pages = {3783--3785}, paper = {FPAH048}, venue = {Chicago, IL, USA, Jun. 2001}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/p01/papers/FPAH048.pdf}, language = {english} } @inproceedings{kirschner:ipac17-tupab028, author = {H. Kirschner and A. Jankowiak and T. Kamps and J. Kuehn and M. A. H. Schmeisser}, title = {{Measuring the Spectral Response of Cs-K-Sb Photocathodes for BERLinPro}}, booktitle = {Proc. IPAC'17}, pages = {1378--1380}, paper = {TUPAB028}, venue = {Copenhagen, Denmark, May 2017}, publisher = {JACoW Publishing, Geneva, Switzerland}, doi = {10.18429/JACoW-IPAC2017-TUPAB028}, url = {https://jacow.org/ipac2017/papers/TUPAB028.pdf}, language = {english} } @inproceedings{takayama:ipac11-weps075, author = {K. Takayama and T. Adachi and W. Jiang and H. Tsutsui}, title = {{Induction Sector Cyclotron for Cluster Ions}}, booktitle = {Proc. IPAC'11}, pages = {2679--2681}, paper = {WEPS075}, venue = {San Sebastian, Spain}, series = {International Particle Accelerator Conference}, number = {2}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {9}, year = {2011}, isbn = {978-9-29-083366-6}, url = {https://jacow.org/IPAC2011/papers/WEPS075.pdf}, language = {english} } @inproceedings{cook:pac91, author = {D. L. Cook}, title = {{Progress in Light Ion Fusion}}, booktitle = {Proc. PAC'91}, pages = {537--542}, paper = {}, venue = {San Francisco, CA, USA, May 1991}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} }

References

• P. A. McIntosh et al., “Preparations for Assembly of the International ERL Cryomodule at Daresbury Laboratory”, in Proc. 23rd Particle Accelerator Conf. (PAC'09), Vancouver, Canada, May 2009, paper WE5PFP050, pp. 2113-2115.
• M. Bocciai et al., “The ANKA RF Cavities”, in Proc. 6th European Particle Accelerator Conf. (EPAC'98), Stockholm, Sweden, Jun. 1998, paper TUP15C, pp. 1817-1819.
• B. Simon, R. Maier, and G. Wuestefeld, “Analysis of the Triple Bend Achromat as a Lattice for BESSY II”, in Proc. 1st European Particle Accelerator Conf. (EPAC'88), Rome, Italy, Jun. 1988, pp. 875-878.
• J. Krall, M. Friedman, Y. Y. Lau, and V. Serlin, “Numerical and Experimental Studies of Particle Accelerators Powered by Modulated Intense Relativistic Electron Beams”, in Proc. 13th Particle Accelerator Conf. (PAC'89), Chicago, IL, USA, Mar. 1989, pp. 609-612.
• S. Matsuzaki, M. Nishida, K. Sakaue, M. Washio, and H. Iijima, “Study of Cs-Te Photocathode for RF Electron Gun”, in Proc. 6th Int. Particle Accelerator Conf. (IPAC'15), Richmond, VA, USA, May 2015, pp. 1632-1634.
• D. A. Herrup et al., “Time-Varying Sextupole Corrections During the Tevatron Ramp”, in Proc. 13th Particle Accelerator Conf. (PAC'89), Chicago, IL, USA, Mar. 1989, pp. 518-521.
• T. A. Mehlhorn and J. P. Quintenz, “PIC Simulations of an Achromatic Solenoidal Focusing System for LMF”, in Proc. 13th Particle Accelerator Conf. (PAC'89), Chicago, IL, USA, Mar. 1989, pp. 1014-1017.
• S. Ohsawa et al., “Progress of Electron Gun Systems for the e-/e+ Linac at KEK”, in Proc. 1988 Linear Accelerator Conf. (LINAC'88), Williamsburg, VA, USA, Oct. 1988, paper WE3-50, pp. 434-436.
• C. S. Hwang, C. H. Chang, T. C. Fan, G. J. Hwang, F. U. Lin, and P. K. Tseng, “Results Analysis of Measurement of the Multipole Magnet with Hall Probe”, in Proc. 4th European Particle Accelerator Conf. (EPAC'94), London, UK, Jun.-Jul. 1994, pp. 1244-1247.
• C. A. Frost, C. E. Crist, G. T. Leifeste, R. B. Miller, W. W. Reinstra, and S. L. Shope, “Magnetic Bending of Laser-Guided Electron Beams”, in Proc. 11th Particle Accelerator Conf. (PAC'85), Vancouver, Canada, May 1985, pp. 2754-2757.
• T. Adachi, Y. Kanai, Y. Mori, and H. Someya, “Possibility of Resonant Excitation of the JHF 3-GeV Synchrotron Magnets Using A Multi-Network”, in Proc. 6th European Particle Accelerator Conf. (EPAC'98), Stockholm, Sweden, Jun. 1998, paper TUP24G, pp. 2053-2055.
• V. Tzoganis, O. Kamigaito, M. Kase, T. Nagatomo, T. Nakagawa, and C. P. Welsch, “Development of an Online Emittance Monitor for Low Energy Heavy Ion Beams”, in Proc. 13th Int. Conf. on Heavy Ion Accelerator Technology (HIAT'15), Yokohama, Japan, Sep. 2015, paper WEPB24, pp. 250-252.
• N. Sakamoto et al., “Commissioning of a New Injector for the RIKEN RI-Beam Factory”, in Proc. 26th Linear Accelerator Conf. (LINAC'12), Tel Aviv, Israel, Sep. 2012, paper MO3A02, pp. 125-129.
• C. L. Bohn et al., “Physics Goals for the Planned Next Linear Collider Engineering Test Facility”, in Proc. 19th Particle Accelerator Conf. (PAC'01), Chicago, IL, USA, Jun. 2001, paper FPAH048, pp. 3783-3785.
• H. Kirschner, A. Jankowiak, T. Kamps, J. Kuehn, and M. A. H. Schmeisser, “Measuring the Spectral Response of Cs-K-Sb Photocathodes for BERLinPro”, in Proc. 8th Int. Particle Accelerator Conf. (IPAC'17), Copenhagen, Denmark, May 2017, pp. 1378-1380.
• K. Takayama, T. Adachi, W. Jiang, and H. Tsutsui, “Induction Sector Cyclotron for Cluster Ions”, in Proc. 2nd Int. Particle Accelerator Conf. (IPAC'11), San Sebastian, Spain, Sep. 2011, paper WEPS075, pp. 2679-2681.
• D. L. Cook, “Progress in Light Ion Fusion”, in Proc. 14th Particle Accelerator Conf. (PAC'91), San Francisco, CA, USA, May 1991, pp. 537-542.