Schmidt, Wolf Gero, and K. Seino. “Pyrrole (NH) and Polypyrrole Functionalized  Silicon Surfaces Calculated from First Principles.”https://doi.org/10.1142/s0218625x03004901__Surface Review and Letters 10, no. 2–3 (2003): 221–26.https://doi.org/10.1142/s0218625x03004901 .

Hahn, P. H., and Wolf Gero Schmidt. “Surface Ordering of P-Rich InP(001): Hydrogen Stabilization vs Electron Correlation.”https://doi.org/10.1142/s0218625x03004913__Surface Review and Letters 10, no. 2–3 (2003): 163–67.https://doi.org/10.1142/s0218625x03004913 .

Schmidt, Wolf Gero, J. L. FATTEBERT, J. BERNHOLC, and F. BECHSTEDT. “SELF-ENERGY EFFECTS IN THE OPTICAL ANISOTROPY OF GaP(001).”https://doi.org/10.1142/s0218625x99001281__Surface Review and Letters 6, no. 6 (1999): 1159–65.https://doi.org/10.1142/s0218625x99001281 .