A. V. Romanenko, A. G. Ponomarev, “The effect of magnetic quadrupole lens hysteresis on the focusing of an ion beam with variable energy in a nuclear scanning microprobe”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 39:7 (2013), 1–8; Tech. Phys. Lett., 39:4 (2013), 317–320
