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%\cite{Vorontsov:RuPAC2018-TUPSA18}
\bibitem{Vorontsov:RuPAC2018-TUPSA18}
V.A. Vorontsov,
\textquotedblleft{About One Way of the Solution of the Hill Equation}\textquotedblright,
% presented at RuPAC2018, Protvino, Russia, Oct. 2018, paper TUPSA18, unpublished.
presented at the 26th Russian Particle Accelerator Conf. (RuPAC'18), Protvino, Russia, Oct. 2018, paper TUPSA18, unpublished.