Feed, food and fuel: Competition and potential impacts on small-scale crop-livestock-energy farming systems - Dixon, John A.; Li, X.; Msangi, Siwa; Amede, Tilahun; Bossio, Deborah A.; Ceballos, H.; Ospina, B.; Howeler, Reinhardt H.; Reddy, B.V.S.; Abaidoo, Robert C.; Timsina, J.; Crissman, C.C.; et al. (International Livestock Research Institute, 2010)