@INBOOK {KRISTJANSON:2003, title = {Evaluating adoption to new crop-livestock-soil management technologies using georeferenced village-level data: the case of cowpea in the dry savannas of West Africa. Pages 169-180 in Natural resources management in African agriculture}, author = {Kristjanson, P. and Okike, I. and Tarawali, S. and Kruska, R. and Manyong, V. and Singh, B. }, year = {2003}, }