Nickolova, Matina. 2016. “STUDY ON THE DURATON OF EMBRIONIC DEVELOPMENT AND CHICKEN BODY WEIGHT АТ HATHING IN OSTRICHES (STRUTHIO CAMELUS)”. Bulgarian Journal of Animal Husbandry 53 (3-6): 64-71. https://agriacad.eu/ojs/index.php/bjah/article/view/338.