Shop, I. V., Holubkina Y. О., T. M. Tykhonova, T. A. Derienko, and O. V. Al-Trawneh. “Diagnosis Difficulties in Elderly Patients With Atrial Fibrillation and Complete Atrioventricular Block”. Pathologia, vol. 18, no. 3, Dec. 2021, pp. 365-70, doi:10.14739/2310-1237.2021.3.243299.