[n] E. D. Hudson, “Helical Axial Injection Concept for Cyclotrons”, in Proc. Cyclotrons'81, Caen, France, Sep. 1981, paper DP-11, pp. 311-313.
%\cite{Hudson:Cyclotrons81-DP-11} \bibitem{Hudson:Cyclotrons81-DP-11} E. D. Hudson, \textquotedblleft{Helical Axial Injection Concept for Cyclotrons}\textquotedblright, in \emph{Proc. Cyclotrons’81}, Caen, France, Sep. 1981, paper DP--11, pp. 311--313.
@inproceedings{hudson:cyclotrons81-dp-11, author = {E. D. Hudson}, title = {{Helical Axial Injection Concept for Cyclotrons}}, booktitle = {Proc. Cyclotrons'81}, pages = {311--313}, paper = {DP-11}, venue = {Caen, France, Sep. 1981}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/c81/papers/DP-11.pdf}, language = {english} }