Biomass pressures in mixed farms: Implications for livelihoods and ecosystems services in South Asia and sub-Saharan Africa - Valbuena, Diego; Erenstein, Olaf; Homann-Kee Tui, Sabine; Abdoulaye, Tahirou; Duncan, Alan J.; Gerard, Bruno G.; Teufel, Nils (International Livestock Research Institute, 2012)