Y. Hara \emph{et al.},
   "Development of Three-Dimensional Dose Verification System using a Fluorescent Screen in Ion Beam Therapy",
   in Proc. 3rd International Beam Instrumentation Conference, Monterey, CA, USA, paper WEPF24, pp. 601–604,
    ISBN: 978-3-95450-141-0,
    \url{http://jacow.org/IBIC2014/papers/wepf24.pdf},
    2014.