Erkinovna, E. N. ., and Ulugbekovna О. А. . “THE COURSE OF COMORBID CONDITIONS IN DIFFERENT FUNCTIONAL CLASSES OF CHRONIC HEART FAILURE”. INTERNATIONAL CONFERENCE ON MULTIDISCIPLINARY RESEARCH AND INNOVATIVE TECHNOLOGIES, vol. 1, no. 1, Aug. 2021, pp. 131-4, https://mrit.academiascience.org/index.php/mrit/article/view/38.