P. Thieberger \emph{et al.}, "The Electron Backscattering Detector (eBSD), a New Tool for the Precise Mutual Alignment of the Electron and Ion Beams in Electron Lenses", in Proc. 3rd International Beam Instrumentation Conference, Monterey, CA, USA, paper MOPD02, pp. 129–133, ISBN: 978-3-95450-141-0, \url{http://jacow.org/IBIC2014/papers/mopd02.pdf}, 2014.