Wade D. Cook, Feng Yang, Joe Zhu. Nonlinear inputs and diminishing marginal value in DEA. JORS, 60(11):1567-1574, 2009. [doi]
@article{CookYZ09,
title = {Nonlinear inputs and diminishing marginal value in DEA},
author = {Wade D. Cook and Feng Yang and Joe Zhu},
year = {2009},
doi = {10.1057/jors.2008.121},
url = {http://dx.doi.org/10.1057/jors.2008.121},
researchr = {https://researchr.org/publication/CookYZ09},
cites = {0},
citedby = {0},
journal = {JORS},
volume = {60},
number = {11},
pages = {1567-1574},
}