References
- Meyer, A., J.Photogr.Science, 13, 90 (1965).
- Schumacher, E., SPSE-Conference, Washington (1969), p. 38.
- Schellenberger, M. und Steinmetz, R., Helvetia Chimica Acta, 52, 433 (1969).
- Schellenberger, M., Helvetia Chimica Acta, 53, 1151 and 1169 (1970)