[n] R. L. Fleming et al., “A Simple Variable Focus Lens for Field Emitter Cathodes”, in Proc. IPAC'18, Vancouver, Canada, Apr.-May 2018, pp. 3677-3679. doi:10.18429/JACoW-IPAC2018-THPAL024
%\cite{Fleming:IPAC18-THPAL024} \bibitem{Fleming:IPAC18-THPAL024} R. L. Fleming \emph{et al.}, \textquotedblleft{A Simple Variable Focus Lens for Field Emitter Cathodes}\textquotedblright, in \emph{Proc. IPAC’18}, Vancouver, Canada, Apr.-May 2018, pp. 3677--3679. \url{doi:10.18429/JACoW-IPAC2018-THPAL024}
@inproceedings{fleming:ipac18-thpal024, author = {R. L. Fleming and others}, title = {{A Simple Variable Focus Lens for Field Emitter Cathodes}}, booktitle = {Proc. IPAC'18}, pages = {3677--3679}, paper = {THPAL024}, venue = {Vancouver, Canada, Apr.-May 2018}, publisher = {JACoW Publishing, Geneva, Switzerland}, doi = {10.18429/JACoW-IPAC2018-THPAL024}, url = {http://accelconf.web.cern.ch/ipac2018/papers/THPAL024.pdf}, language = {english} }