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Schöll, E. and Heisel, W. and Prettl, Wilhelm (1982) Impact ionization induced negative far-infrared photoconductivity inn-GaAs. Zeitschrift für Physik B: Condensed Matters 47 (4), pp. 285-291.
Heisel, W. and Böhm, W. and Prettl, Wilhelm (1981) Negative FIR-photoconductivity in n-GaAs. International Journal of Infrared and Millimeter Waves 2 (4), pp. 829-837.
Lengfellner, Hans and Pauli, G. and Heisel, W. and Renk, Karl Friedrich (1976) Tunable Quantum Counter For Far-Infrared Radiation. Applied Physics Letters 29 (9), pp. 566-567.