L.  Raimondi, Svetina, C., Mahne, N., Cocco, D., Capotondi, F., Pedersoli, E., Manfredda, M., Kiskinova, M., and Zangrando, M., ?Active optics systems at FERMI free electron laser?, in Adaptive Optics: Analysis, Methods and Systems, AO 2015, 2015, p. 289.