@article{lertworasirikul_charnsethikul_fang_2011, title={Inverse data envelopment analysis model to preserve relative efficiency values: The case of variable returns to scale}, volume={61}, DOI={10.1016/j.cie.2011.06.014}, number={4}, journal={Computers & Industrial Engineering}, author={Lertworasirikul, S. and Charnsethikul, P. and Fang, S. C.}, year={2011}, pages={1017–1023} }
 @article{lertworasirikul_fang_joines_nuttle_2003, title={Fuzzy data envelopment analysis (DEA): a possibility approach}, volume={139}, DOI={10.1016/S0165-0114(02)00484-0}, number={2}, journal={Fuzzy Sets and Systems}, author={Lertworasirikul, S. and Fang, S. C. and Joines, J. A. and Nuttle, H. L. W.}, year={2003}, pages={379–394} }