Kulik, A.L., A.K. Zaderihin, V.I. Shulgin, and IabluchanskyiМ.I. 1. “RESPIRATION RATES AND HEART RATE VARIABILITY IN HEALTHY VOLUNTEERS IN BIOFEEDBACK CONNECTION”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 18 (1), 20-25. https://periodicals.karazin.ua/medicine/article/view/6951.