Eco-efficiency evaluation for industrial parks with pollutant emissions with a nonconvex nonparametric techniqueKefan Zhu, Qingxian An, Xian Gao, Haoyun Chen and Ping WangRAIRO-Oper. Res., 59 3 (2025) 1363-1378DOI: https://doi.org/10.1051/ro/2025033
