[n] P. Roussel and J. M. De Coster, “An Achromatic Beam Transfer System with a Strongly Negative Equivalent Length”, in Proc. Cyclotrons'81, Caen, France, Sep. 1981, paper EP-38, pp. 521-523.
%\cite{Roussel:Cyclotrons81-EP-38} \bibitem{Roussel:Cyclotrons81-EP-38} P. Roussel and J. M. De Coster, \textquotedblleft{An Achromatic Beam Transfer System with a Strongly Negative Equivalent Length}\textquotedblright, in \emph{Proc. Cyclotrons’81}, Caen, France, Sep. 1981, paper EP--38, pp. 521--523.
@inproceedings{roussel:cyclotrons81-ep-38, author = {P. Roussel and J. M. De Coster}, title = {{An Achromatic Beam Transfer System with a Strongly Negative Equivalent Length}}, booktitle = {Proc. Cyclotrons'81}, pages = {521--523}, paper = {EP-38}, venue = {Caen, France, Sep. 1981}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/c81/papers/EP-38.pdf}, language = {english} }