A.A.~Nosych, U.~Iriso, A.~Olmos, and M.~Wendt,
   "Overview of the Geometrical Non-Linear Effects of Button BPMs and Methodology for Their Efficient Suppression",
   in Proc. 3rd International Beam Instrumentation Conference, Monterey, CA, USA, paper TUPF03, pp. 298–302,
    ISBN: 978-3-95450-141-0,
    \url{http://jacow.org/IBIC2014/papers/tupf03.pdf},
    2014.