Vacuum

Bannenberg, J. G, Urbanus, W. H, Wojke, R. -G. C, Klein, H, Schempp, A, Thomae, R. W, … van Amersfoort, P. W. (1989). Matching, transport and bunching of four 40-keV ion beams with an electrostatic quadrupole channel. Vacuum, 39, 1031–1033.