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Moser, K. and Eisfeld, W. and Werling, U. and Wahl, S. and Prettl, Wilhelm (1984) High‐speed photoconductivity and infrared to visible up‐conversion in GaP light‐emitting diodes. Applied Physics Letters 45 (7), p. 711.
Eisfeld, W. and Werling, U. and Prettl, Wilhelm (1983) Infrared to visible up‐conversion using GaP light‐emitting diodes. Applied Physics Letters 42 (3), p. 276.
Lengfellner, Hans and Werling, U. and Hummel, J. and Netter, H. and Retzer, N. and Renk, Karl Friedrich (1981) Concentration dependence of the Ebar-]2abar far-infrared transition of excited chromium ions in ruby. Solid State Communications 38 (12), pp. 1215-1217.
Eisfeld, W. and Werling, U. and Prettl, Wilhelm (1982) Infrared to visible up-conversion with LED-arrays. In: Goetzberger, Adolf, (ed.) 12th European Solid State Device Research Conference, ESSDERC 82, Munich, September 13th - 16th, 1982: 7th Symposium on Solid State Device Technology. Europhysics conference abstracts, 6,F. Physik-Verlag, Weinheim. ISBN 3-87664-072-5.
Eisfeld, W. and Werling, U. and Prettl, Wilhelm (1983) Infrared to visible up-conversion using light-emitting diodes. In: The 7th International Conference on Infrared and Millimeter Waves, 14.–18. Februar 1983, Marseille, Frankreich.