Development of approaches to the diagnosis of cattle leukemia in the system of antiepizootic measures in the Belgorod RegionAnatoly Kovalenko, Irina Donnik, Andrey Dorofeev, Svetlana Belyaeva, Nazar Yavnikov, Victoria Oskolskaya, Danila Karaychentsev and Maxim PetropavlovskiyBIO Web Conf., 30 (2021) 06002DOI: https://doi.org/10.1051/bioconf/20213006002