JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, vol. 22, no. 5, page. 1948 - 1955, 2004-09
NUCLEAR FUSION, vol. 51, no. 9, page. 94006 - 12, 2011-09
IEEE TRANSACTIONS ON PLASMA SCIENCE, vol. 33, no. 2, page. 538 - 539, 2005-04