1. Pullman, A. and Pullman, B., Adv. Quantum Chem. 4 267 (1968).
2. Rein, R., Claverie, P. and Pollak, M., Int. J. Quantum Chem. 2 129 (1968).
3. Bertran, J., J. Theor. Biol. 34 353 (1972).
4. Kudritskaya, Z. G., Zheltovsky, N. V., Pechenaya, V. I., and Danilov, V. I., IV Int. Biophys. Congress, Abstracts, Vol. 2, Moscow, 1972, pp. 220.
5. Danilov, V. I., Zheltovsky, N. V., and Kudritskaya, Z. G., Preprint ITP-73-109R, Kiev (1973);