Radjabova G, Nazarova J, Rakhmatova S, and Ubaydullaeva N. “CHARACTERISTIC OF SLEEP APNEA SYNDROME IN PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY ILLNESS”. International Engineering Journal For Research & Development, vol. 6, no. 1, Jan. 2021, p. 4, doi:10.17605/OSF.IO/Q7T2Z.