The impact of avian flu on livelihood outcomes in Africa: Evidence from Ethiopia, Ghana, Kenya and Nigeria - Birol, Ekin; Asare-Marfo, Dorene; Ayele, Gezahegn; Mensah-Bonsu, Akwesi; Ndirangu, Lydia; Okpukpara, Benjamin; Roy, Devesh; Yakhshilikov, Yorbol (2013)