info:oai:icrisat:7327info:ofi/fmt:xml:xsd:journalDuncanA JDuncan, A JTarawaliSTarawali, SThorneP JThorne, P JValbuenaDValbuena, DDescheemaekerKDescheemaeker, KHomann-Kee TuiSHomann-Kee Tui, SIntegrated crop-livestock systems − a key to sustainable intensification in AfricaTropical Grasslands – Forrajes Tropicales2346-377520131202-2062article