Metal-insulator transition in Si(111)-(4 × 1)/(8 × 2)-In studied by optical spectroscopy - Speiser, E.; Chandola, S.; Hinrichs, K.; Gensch, M.; Cobet, C.; Wippermann, S.; Schmidt, Wolf Gero; Bechstedt, F.; Richter, W.; Fleischer, K.; McGilp, J. F.; Esser, N. (physica status solidi (b))