@article{RO_2016__50_4-5_965_0,
     author = {Shi, Xiao},
     title = {Environmental efficiency analysis based on relational two-stage {DEA} model},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {965--977},
     publisher = {EDP-Sciences},
     volume = {50},
     number = {4-5},
     year = {2016},
     doi = {10.1051/ro/2015059},
     mrnumber = {3570542},
     zbl = {1353.90053},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ro/2015059/}
}