SURFACE SCIENCE, vol. 603, no. 24, page. 3445 - 3447, 2009-12-15
PHYSICAL REVIEW B, vol. 80, no. 24, page. 241401 - 241401, 2009-12
JOURNAL OF PHYSICS-CONDENSED MATTER, vol. 21, no. 20, page. 202101, 2009-05-20
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, vol. 27, no. 3, page. 485 - 491, 2009-05