@ARTICLE {BERKHOUT:2011, title = {Heterogeneity in farmers' production decisions and its impact on soil nutrient use: results and implications from northern Nigeria}, author = {Berkhout, E. and Schipper, R. A. and van Keulen, H. and Coulibaly, O. }, journal = {Agricultural Systems}, year = {2011}, month = {January}, volume = {104}, number = {1}, pages = {63--74}, issn = {0308-521X}, doi = {10.1016/j.agsy.2010.09.006}, }