1. S. S. Azizova, I. S. Chekman, and A. P. Viktorov, Pharmacology of Cardioactive Drugs in Early Ontogeny [in Russian], Tashkent (1982), p. 43.
2. L. I. Budarin, I. I. Sakharchuk, and I. S. Chekman, Physical Chemistry and Clinical Pharmacology of Cardiac Glycosides [in Russian], Kiev (1985), p. 56.
3. V. V. Gatsura and A. N. Kudrin, Cardiac Glycosides in the Combination Pharmacotherapy of Heart Failure [in Russian], Moscow (1983), p. 35.
4. E. V. Gubler, Computerized Methods of Analysis and Diagnosis of Pathological Processes [in Russian], Leningrad (1978), pp. 72?75.
5. Z. Lojda, R. Gossrau, and T. H. Schiebler, Enzyme Histochemistry: A Laboratory Manual, Berlin (1979).