Pyrrole (NH) and Polypyrrole Functionalized  Silicon Surfaces Calculated from First Principles
W.G. Schmidt, K. Seino, Surface Review and Letters 10 (2003) 221–226.

Surface Ordering of P-rich InP(001): Hydrogen Stabilization vs Electron Correlation
P.H. Hahn, W.G. Schmidt, Surface Review and Letters 10 (2003) 163–167.

SELF-ENERGY EFFECTS IN THE OPTICAL ANISOTROPY OF GaP(001)
W.G. Schmidt, J.L. FATTEBERT, J. BERNHOLC, F. BECHSTEDT, Surface Review and Letters 6 (1999) 1159–1165.