K. Nanbu \emph{et al.}, "Linear Focal Cherenkov-Ring Camera for Single Shot Observation of Longitudinal Phase Space Distribution for Non-Relativistic Electron Beam", in Proc. 3rd International Beam Instrumentation Conference, Monterey, CA, USA, paper TUPF26, pp. 385–388, ISBN: 978-3-95450-141-0, \url{http://jacow.org/IBIC2014/papers/tupf26.pdf}, 2014.