Author： Vanlauwe B. Bationo A. Chianu J. Giller K.E. Merckx R. Mokwunye U. Ohiokpehai O. Pypers P. Tabo R. Shepherd K.D. Smaling E.M.A. Woomer P.L. Sanginga N.
Publisher： IP Publishing Ltd
ISSN： 0030-7270
Source： Outlook on Agriculture, Vol.39, Iss.1, 2010-03, pp. : 17-24
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