[n] R. C. Niemann et al., “APS Storage Ring Vacuum System Development”, in Proc. PAC'91, San Francisco, CA, USA, May 1991, pp. 29-32.
%\cite{Niemann:PAC91} \bibitem{Niemann:PAC91} R. C. Niemann \emph{et al.}, \textquotedblleft{APS Storage Ring Vacuum System Development}\textquotedblright, in \emph{Proc. PAC’91}, San Francisco, CA, USA, May 1991, pp. 29--32.
@inproceedings{niemann:pac91, author = {R. C. Niemann and others}, title = {{APS Storage Ring Vacuum System Development}}, booktitle = {Proc. PAC'91}, pages = {29--32}, paper = {}, venue = {San Francisco, CA, USA, May 1991}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} }