@ARTICLE {SMITH: 1994b, title = {The role of technology in agricultural intensification: the evolution of maize production in the northern Guinea savanna of Nigeria}, author = {Smith, J. and Barau, A. D. and Goldman, A. and Mareck, J. H. }, journal = {Economic Development and Cultural Change}, year = {1994}, volume = {42}, number = {3}, pages = {537--554}, }