Global Patterns in Seasonal Activity of Influenza A/H3N2, A/H1N1, and B from 1997 to 2005: Viral Coexistence and Latitudinal Gradients.

Finkelman, B. S., C. Viboud, K. Koelle, M. J. Ferrari, N. Bharti, and B. T. Grenfell. 2007. Global Patterns in Seasonal Activity of Influenza A/H3N2, A/H1N1, and B from 1997 to 2005: Viral Coexistence and Latitudinal Gradients. Plos One 2:ARTN e1296.