Lazarov, I., G. Zhelev, M. Lytzkanov, K. Koev, and V. Petrov. “Dynamics of Microbial Contamination in a Poultry Hatchery”. Archives of Veterinary Medicine, vol. 11, no. 1, Sept. 2018, pp. 37-44, doi:10.46784/e-avm.v11i1.15.