Duncan, A., Tarawali, S., Thorne, P., Valbuena, D., Descheemaeker, K. and Homann-Kee Tui, S. (2013) “Integrated crop-livestock systems − a key to sustainable intensification in Africa”, Tropical Grasslands-Forrajes Tropicales, 1(2), pp. 202–206. doi: 10.17138/tgft(1)202-206.