Viryanski, D., A. . Teneva, E. Todorovska, I. Dimitrova, and K. Georgiev. “Genetic Variability of 11 Microsatellites Markers of Brown Cattle, Reared in Bulgaria”. Journal of BioScience and Biotechnology, vol. 9, no. 2, Sept. 2020, pp. 23-28, https://editorial.uni-plovdiv.bg/index.php/JBB/article/view/335.