СЕЙТКАМАЛОВ, Хайратдин. “THE STUDIES OF AGE-RELATED CHANGES IN ELECTROCARDIOGRAPHIC PARAMETERS IN CALVES OF DIFFERENT BREEDS IN THE ENVIRONMENTAL CONDITIONS OF THE REPUBLIC OF KARAKALPAKSTAN”. «ACTA NUUz», vol. 3, no. 3.1, July 2026, pp. 169-71, http://journals.nuu.uz/index.php/actanuuz/article/view/14038.