For citations:
Belyayeva V.A., Datieva F.S., Gagiev A.Ch. The study of heart rate variability in elderly patients with chronic obstructive pulmonary disease undergoing inpatient treatment in a mid-mountain environment. Bulletin Physiology and Pathology of Respiration. 2026;(99):20-35. (In Russ.) https://doi.org/10.36604/1998-5029-2026-99-20-35
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