J. A. Sharp, W. Meng, W. Liu. A modified slacks-based measure model for data envelopment analysis with 'natural' negative outputs and inputs. JORS, 58(12):1672-1677, 2007. [doi]
@article{SharpML07,
title = {A modified slacks-based measure model for data envelopment analysis with 'natural' negative outputs and inputs},
author = {J. A. Sharp and W. Meng and W. Liu},
year = {2007},
doi = {10.1057/palgrave.jors.2602318},
url = {https://doi.org/10.1057/palgrave.jors.2602318},
researchr = {https://researchr.org/publication/SharpML07},
cites = {0},
citedby = {0},
journal = {JORS},
volume = {58},
number = {12},
pages = {1672-1677},
}