APPLIED PHYSICS LETTERS, vol. 91, no. 19, 2007-11-05
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, vol. 21, no. 4, page. 1297 - 1300, 2003-07
APPLIED SURFACE SCIENCE, vol. 173, no. 1-2, page. 22 - 29, 2001-03-22
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, vol. 18, no. 2, page. 868 - 872, 2000-03