Rusev, I. T., V. D. Vinnik, and D. A. Sokolovskiy. 2012. “Birds As the Probable Factor of Introduction and Spread of Highly Pathogenic Avian Influenza H5N1 in Megapolis Conditions”. Regulatory Mechanisms in Biosystems 3 (1), 125-32. https://doi.org/10.15421/021218.