1. Fox, S. W. and Dose, K.: 1977, ‘Molecular Evolution and the Origin of Life,’ Marcel Dekker, New York, p. 49.
2. Gest, H.: 1981,FEMS Microbiol. Lett.,12, 209.
3. Hammond, G. S., Noyes, W. A., and Pitts, J. N.: 1968, ‘Advances in Photochemistry,’ Interscience Publishers, New York,6, p. 112–113.
4. Knenokh, M. A. and Bodgonova, N. P.: 1968,Dokl.Akad.Nauk.USSR. 182, 715–718.
5. Knenokh, M. A. and Bogdonova, N. P.: 1971,Probl. Kosm. Biol. 16, 313–324.