JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, vol. 23, no. 4, page. 699 - 704, 2005-07
IEEE TRANSACTIONS ON PLASMA SCIENCE, vol. 32, no. 1, page. 47 - 53, 2004-02
CONTRIBUTIONS TO PLASMA PHYSICS, vol. 44, no. 5-6, page. 536 - 541, 2004-01