@inbook{oelsligle_mccollum_kang_1976, title={Soil fertility management in tropical multiple cropping}, DOI={10.2134/asaspecpub27.c14}, number={27}, booktitle={ASA Special Publication}, author={Oelsligle, D. D. and McCollum, R. E. and Kang, B. T.}, year={1976}, pages={275} }