[n] S. Herb, “Betatron Tune Measurement System for the HERA Proton Storage Ring”, in Proc. PAC'91, San Francisco, CA, USA, May 1991, pp. 1222-1225.
%\cite{Herb:PAC91} \bibitem{Herb:PAC91} S. Herb, \textquotedblleft{Betatron Tune Measurement System for the HERA Proton Storage Ring}\textquotedblright, in \emph{Proc. PAC’91}, San Francisco, CA, USA, May 1991, pp. 1222--1225.
@inproceedings{herb:pac91, author = {S. Herb}, title = {{Betatron Tune Measurement System for the HERA Proton Storage Ring}}, booktitle = {Proc. PAC'91}, pages = {1222--1225}, paper = {}, venue = {San Francisco, CA, USA, May 1991}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} }