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.