Tsankova, M., S. Kostadinova, I. Iliev, and M. Marhova. “Аntibiotic and Serum Resistance of Enterobacteriaceae Strains Isolated from Outpatients With Infections of Urogenital Tract”. Journal of BioScience and Biotechnology, vol. 7, no. 2-3, Feb. 2019, pp. 109-16, https://editorial.uni-plovdiv.bg/index.php/JBB/article/view/220.