F. K. Rakhmatullov, A. M. Kuryaeva, I. J. Moiseeva, L. F. Burmistrova, and N. E. Dyatlov, “ELECTROPHYSIOLOGICAL EFFECTS OF VALSALVA MANOEUVER DURING EARLY PREGNANCY IN PATIENTS WITH PAROXYSMS OF ORTHODROMIC ATRIOVENTRICULAR TACHYCARDIA”, Asian J Pharm Clin Res, vol. 10, no. 8, pp. 108–112, Aug. 2017.