1. Haberditzl, W., and Muller, K., Z. Naturforsch., 20 b, 517 (1965); Angew. Chemie, 76, 891 (1964).
2. Akoyunoglou, G., Nature, 202, 452 (1964).
3. Sister Smith, M. J., and Cook, E. S., in Biological Effects of Magnetic Fields, 246 (edit. by Barnothy, M. F.) (New York, 1964).
4. Dorfman, G., Biophysics (Russ.), 6, 733 (1962).
5. Neurath, P. W., in Biological Effects of Magnetic Fields (edit. by Barnothy, M. F.), 25 (New York, 1964).