Carlson, P. S., Science, 168, 487 (1970).
Binding, H., Binding, K., and Straub, J., Naturwissenschaften, 57, 138 (1970).
Maliga, P., Márton, L., and Sz.-Breznovits, Á., Plant Sci. Lett., 1, 119 (1973).
Binding, H., Z. Pflanzenzuchts, 67, 3 (1972).
Linsmaier, E. M., and Skoog, F., Physiol. Plant., 18, 100 (1965).
Maliga, P., and Szilágyi, L., Bot. Közlem. (in the press).
Nitsch, J. P., Phytomorphology, 19, 389 (1969).
Sacristan, M. D., Chromosoma, 33, 273 (1971).
Sager, R., Science, 132, 1459 (1960).
Pestka, S., Ann. Rev. Microbiol., 25, 483 (1971).
Tewari, K. K., Ann. Rev. Plant Physiol., 22, 141 (1971).