C.S. Simon \emph{et al.},
   "Numerical Calculations for the FAIR Proton Linac BPMs",
   in Proc. 3rd International Beam Instrumentation Conference, Monterey, CA, USA, paper TUPF04, pp. 303–306,
    ISBN: 978-3-95450-141-0,
    \url{http://jacow.org/IBIC2014/papers/tupf04.pdf},
    2014.