[n] I. Borchardt et al., “Installation of the Superconducting Magnets in the HERA Tunnel”, in Proc. PAC'91, San Francisco, CA, USA, May 1991, pp. 857-860.
%\cite{Borchardt:PAC91} \bibitem{Borchardt:PAC91} I. Borchardt \emph{et al.}, \textquotedblleft{Installation of the Superconducting Magnets in the HERA Tunnel}\textquotedblright, in \emph{Proc. PAC’91}, San Francisco, CA, USA, May 1991, pp. 857--860.
@inproceedings{borchardt:pac91, author = {I. Borchardt and others}, title = {{Installation of the Superconducting Magnets in the HERA Tunnel}}, booktitle = {Proc. PAC'91}, pages = {857--860}, paper = {}, venue = {San Francisco, CA, USA, May 1991}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} }