The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Checchin:SRF2015-MOPB020} \bibitem{Checchin:SRF2015-MOPB020} M.~Checchin, A.~Grassellino, M.~Martinello, A.~Romanenko, and J.~Zasadzinski, \textquotedblleft{Mean Free Path Dependence of the Trapped Flux Surface Resistance}\textquotedblright, % in \emph{Proc. SRF2015}, MOPB020, pp. 129--134, % in \emph{Proc. SRF2015}, Whistler, BC, Canada, 13-18, 2015, paper MOPB020, pp. 129--134, in \emph{Proc. 17th International Conference on RF Superconductivity (SRF2015)}, Whistler, BC, Canada, 13-18, 2015, paper MOPB020, pp. 129--134, ISBN: 978-3-95450-178-6, \url{http://srf2015.vrws.de/papers/mopb020.pdf}, \url{doi:10.18429/JACoW-SRF2015-MOPB020}, 2015.