Georgieva, S., Barzev, G., & Lukanova, N. (2012). DYNAMICS IN DEVELOPMENT OF FAMILIES IN TROTTER BREED POPULATION OF HORSES IN BULGARIA. INFLUENCE OF MARES IMPORTED FROM HUNGARY. Bulgarian Journal of Animal Husbandry, 49(3), 30-36. https://agriacad.eu/ojs/index.php/bjah/article/view/637