@ARTICLE {EHUI:1993a, title = {Measuring the sustainability and economic viability of tropical farming systems: a model from sub-Saharan Africa}, author = {Ehui, S. K. and Spencer, D. }, journal = {Agricultural Economics}, year = {1993}, volume = {9}, number = {4}, pages = {279--296}, issn = {0169-5150}, url = {https://doi.org/10.1016/0169-5150(93)90018-8}, doi = {10.1016/0169-5150(93)90018-8}, }