[n] G. F. Wells and J. W. Johnson, “Ion Source Modification for He- Ions”, in Proc. PAC'69, Washington D.C., USA, Mar. 1969, pp. 41-43.
%\cite{Wells:PAC69} \bibitem{Wells:PAC69} G. F. Wells and J. W. Johnson, \textquotedblleft{Ion Source Modification for He<sup>-</sup> Ions}\textquotedblright, in \emph{Proc. PAC’69}, Washington D.C., USA, Mar. 1969, pp. 41--43.
@inproceedings{wells:pac69, author = {G. F. Wells and J. W. Johnson}, title = {{Ion Source Modification for He<sup>-</sup> Ions}}, booktitle = {Proc. PAC'69}, pages = {41--43}, paper = {}, venue = {Washington D.C., USA}, series = {Particle Accelerator Conference}, number = {3}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {6}, year = {1969}, language = {english} }