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2. T.J. Dougherty, J.E. Kaufman, A. Goldfarb, K.R. Weishaupt, D.G. Boyle, M. Mittelman: Cancer Res. 38, 2628 (1978);
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4. M. Gouterman: In The Porphyrins Vol. III, ed. by D. Dolphin (Academic, New York 1978) pp. 1?165
5. A.J. Campillo, S.L. Shapiro: In Ultrafast Light Pulses, ed. by S.L. Shapiro (Springer, Berlin, Heidelberg 1977) Chap. 7