Srinivasa, J., M. Ramesh Bha, and M. Prabha Adhikari. “RESPIRATORY SINUS ARRHYTHMIA (RSA): NONINVASIVE MEASURE OF PARASYMPATHETIC CARDIAC CONTROL IN NEWLY DIAGNOSED HYPERTENSIVES AND THE INFLUENCE OF ABDOMINAL BREATHING”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 3, 1, pp. 80-85, https://periodicals.karazin.ua/medicine/article/view/7382.