An integrated assessment of global changes in crop-livestock systems to 2030: implications for policy development - Herrero, Mario; Thornton, Philip K.; Notenbaert, An Maria Omer; Msangi, Siwa; Wood, S.; Kruska, Russell L.; Dixon, John A.; Bossio, Deborah A.; Steeg, Jeannette van de; Freeman, H.A.; Gerard, Bruno G. (Wageningen University & Research, 2009)