Kovalenko, L., and A. Kovalenko. “Pathomorphological Changes in the Body of Calves in Protozoosis, Prevention Measures”. Bulletin of Sumy National Agrarian University. The Series: Veterinary Medicine, no. 4 (51), Dec. 2020, pp. 11-18, doi:10.32845/bsnau.vet.2020.4.2.