[Distribution of leukosis-sarcoma complex viruses among birds].
D001355:Alpharetrovirus; D000818:Animals; D001353:Avian Leukosis / Q000453:epidemiology*; D002645:Chickens; D004372:Ducks; D011201:Poultry Diseases / Q000453:epidemiology*; D012509:Sarcoma / Q000453:epidemiology / Q000662:veterinary*; D014586:USSR
Rasprostranenie virusov leĭkozno-sarkomatoznogo kompleksa sredi ptits.