For citations:
Parnes E.Ya., Alexandrova O.D., Perepada E.A., Stryuk R.I., Ioseliani D.G. Episodes of acute heart rate variability decrease in coronary heart disease patients and healthy people at normal levels of physical stress. Cardiovascular Therapy and Prevention. 2005;4(3, ч.II):31-35. (In Russ.)