Shatylo, V. B., L. A. Bodretska, . I. S. Shapovalenko, H. P. Voinarovska, and Z. S. Butynets. “Pentoxyphylline: Possibilities to Reduce Manifestations of Chronic Heart Failure With Preserved Left Ventricular Ejection Fraction in Elderly”. Zaporozhye Medical Journal, vol. 23, no. 1, Apr. 2021, pp. 24-31, doi:10.14739/2310-1210.2021.1.224839.