H. R. Aghababian, V. H. Grigoryan, N. D. Harutyunyan, A. Y. Stepanyan, and L. S. Stepanyan, “INFLUENCE OF CREATIVE ACTIVITY ON PARAMETERS OF THE HEART RHYTHM”, Proc. YSU B: Chem. Biol. Sci., vol. 40, no. 3 (211), pp. 84–89, Oct. 2006.