SURFACE AND INTERFACE ANALYSIS, vol. 44, no. 6, page. 744 - 748, 2012-06
APPLIED PHYSICS LETTERS, vol. 90, no. 24, 2007-06-11
JOURNAL OF APPLIED PHYSICS, vol. 100, no. 4, 2006-08-15
APPLIED SURFACE SCIENCE, vol. 212, page. 630 - 635, 2003-05-15