NANOSCALE, vol. 6, no. 3, page. 1474 - 1479, 2014-01
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, vol. 18, no. 2, page. 868 - 872, 2000-03
SURFACE SCIENCE, vol. 439, no. 1-3, page. L799 - L802, 1999-09-20