R. Bankova, D. Dimitrov, and D. Dimitrova, “HISTOLOGICAL AND HISTOMETRICAL FEATURES OF THE INTESTINAL MORPHOLOGY OF BROILER CHICKENS TREATED WITH DIFFERENT DRUG FORMULATION, CONTAINING OREGANO OIL”, Tradit. Mod. Vet. Med., vol. 4, no. 2, pp. 3–9, Nov. 2019.