Agricultural knowledge, science and technology: Investment and economic returns - Beintema, Nienke M.; Koc, A.; Anandajayasekeram, Ponniah; Isinika, A.; Kimmins, F.; Negatu, Workneh; Osgood, Daniel Edward; Pray, Carl E.; Rivera-Ferre, M.; Santhakumar, V.; Waibel, H. (Island Press, 2008)