[n] H. P. Ehret et al., “The Ion Sources at the Karlsruhe Cyclotron”, in Proc. Cyclotrons'89, Berlin, Germany, May 1989, paper F1-07, pp. 194-196.
%\cite{Ehret:Cyclotrons89-F1-07} \bibitem{Ehret:Cyclotrons89-F1-07} H. P. Ehret \emph{et al.}, \textquotedblleft{The Ion Sources at the Karlsruhe Cyclotron}\textquotedblright, in \emph{Proc. Cyclotrons’89}, Berlin, Germany, May 1989, paper F1--07, pp. 194--196.
@inproceedings{ehret:cyclotrons89-f1-07, author = {H. P. Ehret and others}, title = {{The Ion Sources at the Karlsruhe Cyclotron}}, booktitle = {Proc. Cyclotrons'89}, pages = {194--196}, paper = {F1-07}, venue = {Berlin, Germany, May 1989}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/c89/papers/F1-07.pdf}, language = {english} }