T.F. Heinz, F.J. Himpsel, et al.
Physical Review Letters
T.F. Heinz, F.J. Himpsel, et al.
Physical Review Letters
J.A. Prybyla, T.F. Heinz, et al.
Surface Science
F. De Rougemont, H. Zacharias, et al.
QELS 1989
J.I. Dadap, J. Shan, et al.
Applied Physics B: Lasers and Optics