5Nancy J Cox, Kanta Subbarao, Influenza, THE LANCET . Vol 354 ·October 9.1999.1277--1282.
6Halvorson D. A: Avian influenza: A Minnesota cooperative control program. In Proceedirlgs of the Second International Symposium on Avian Influenza. United States Animal Health Association, Athens, GA, 1987, pp. 327--336.