Risk mapping for HPAI H5N1 in Africa - Improving surveillance for bird flu: User guide for initial bird flu risk maps - Stevens, K.; Glanville, William A. de; Costard, Solenne; Métras, Raphaëlle; Theuri, Wachira; Kruska, Russell L.; Randolph, Thomas F.; Grace, Delia; Hendrickx, Saskia C.J.; Pfeiffer, Dirk U. (International Livestock Research Institute, 2009)