[n] K. Halbach et al., “A Permanent Magnet Undulator for SPEAR”, in Proc. PAC'81, Washington D.C., USA, Mar. 1981, pp. 3136-3139.
%\cite{Halbach:PAC81} \bibitem{Halbach:PAC81} K. Halbach \emph{et al.}, \textquotedblleft{A Permanent Magnet Undulator for SPEAR}\textquotedblright, in \emph{Proc. PAC’81}, Washington D.C., USA, Mar. 1981, pp. 3136--3139.
@inproceedings{halbach:pac81, author = {K. Halbach and others}, title = {{A Permanent Magnet Undulator for SPEAR}}, booktitle = {Proc. PAC'81}, pages = {3136--3139}, paper = {}, venue = {Washington D.C., USA, Mar. 1981}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} }