Debate Persists on Deadly Flu Made Airborne - The New York Timeshttps://www.nytimes.com/2011/12/27/science/debate-persists-on-deadly-flu-made-airborne.html
The Evolution of Bird Flu, and the Race to Keep Up - The New York Timeshttps://www.nytimes.com/2012/06/26/science/the-evolution-of-bird-flu-and-the-race-to-keep-up.html