[n] M. Liepe, “Overview of LLRF Systems”, presented at the PAC'05, Knoxville, TN, USA, May 2005, paper ROAC002, unpublished.
%\cite{Liepe:PAC05-ROAC002} \bibitem{Liepe:PAC05-ROAC002} M. Liepe, \textquotedblleft{Overview of LLRF Systems}\textquotedblright, presented at the PAC’05, Knoxville, TN, USA, May 2005, paper ROAC002, unpublished.
@unpublished{liepe:pac05-roac002, author = {M. Liepe}, title = {{Overview of LLRF Systems}}, booktitle = {Proc. PAC'05}, paper = {ROAC002}, venue = {Knoxville, TN, USA, May 2005}, intype = {presented at the}, series = {Particle Accelerator Conference}, number = {21}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/p05/papers/ROAC002.pdf}, note = {presented at PAC'05, Knoxville, TN, USA, May 2005, paper ROAC002, unpublished}, language = {english} }