SOBOLEV, O.; GUTYJ, B.; PETRYSZAK, R.; GOLODJUK, I.; NAUMYUK, O.; PETRYSZAK, O. The development of the digestive system in broiler chickens at different levels of selenium into the mixed fodder. Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies. Series: Agricultural sciences, v. 20, n. 84, p. 83–87, 28 mar. 2018.