SURFACE SCIENCE, vol. 366, no. 2, page. L709 - L714, 1996-10-20
SURFACE REVIEW AND LETTERS, vol. 3, no. 3, page. 1487 - 1494, 1996-06
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, vol. 80, page. 165 - 168, 1996-05