@article{RO_1991__25_1_31_0,
     author = {K\"orkel, Manfred},
     title = {Discrete facility location with nonlinear facility costs},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {31--43},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {1},
     year = {1991},
     mrnumber = {1110772},
     zbl = {0751.90044},
     language = {en},
     url = {http://archive.numdam.org/item/RO_1991__25_1_31_0/}
}