Rusev, I. T., V. D. Vinnik, and D. A. Sokolovskiy. “Birds As the Probable Factor of Introduction and Spread of Highly Pathogenic Avian Influenza H5N1 in Megapolis Conditions”. Regulatory Mechanisms in Biosystems, Vol. 3, no. 1, Mar. 2012, pp. 125-32, doi:10.15421/021218.