1. N. V. Karsanov, in: Heart Failure and Arrhythmias [in Russian], Leningrad (1966), p. 28.
2. V. I. Mil'ko and B. M. Shchepotin, in: Current Problems in Cardiology [in Russian], Kiev (1965), p. 189.
3. G. V. Chernysheva, Abstracts of Proceedings of an All-Union Conference on Muscle Biochemistry [in Russian], Moscow-Leningrad (1966), p. 143.
4. G. Biörck, Acta Med. Scand.,154, 305 (1956).
5. G. C. Dalli and P. Chiaverini, Minerva Cardiol.,7, 578 (1959).