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

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

Schmidt, Wolf Gero, et al. “SELF-ENERGY EFFECTS IN THE OPTICAL ANISOTROPY OF GaP(001).”10.1142/s0218625x99001281__Surface Review and Letters, vol. 6, no. 6, 1999, pp. 1159–65, doi:10.1142/s0218625x99001281.
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DOI: 10.1142/s0218625x99001281