@ARTICLE {BUTTNER:2003, title = {Farmers' nutrient management practices in indigenous cropping systems in southern Cameroon}, author = {B{\"u}ttner, U. * and Hauser, S. }, journal = {Agriculture, Ecosystems and Environment}, year = {2003}, month = {December}, volume = {100}, number = {2-3}, pages = {103--110}, issn = {0167-8809}, no, }