Improved greenhouse gas emission factors for smallholder livestock systems in East Africa - Merbold, Lutz; Butterbach-Bahl, Klaus; Ericksen, Polly J.; Goopy, John P.; Korir, Daniel; Leitner, Sonja; Mutuo, Paul M.; Ndung’u, Phyllis W.; Onyango, Alice A.; Owino, Jesse; Pelster, David E.; Wanyama, George N. (International Livestock Research Institute, 2018)