[1]
I. V. Dolgova, N. Yabluchansky, L. Martimyanova, and I. Vahreneva, “SPECTRAL ANALYSIS OF HEART RATE VARIABILITY OF ATRIAL FIBRILLATION PATIENTS”, J. V. N. Karazin Khark. Nat. Univ., Ser. Med., no. 2, pp. 35-39, 1.