@article{RO_1984__18_3_203_0,
     author = {Laporte, Gilbert and Mercure, H\'el\`ene and Norbert, Yves},
     title = {Optimal tour planning with specified nodes},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {203--210},
     publisher = {EDP-Sciences},
     volume = {18},
     number = {3},
     year = {1984},
     mrnumber = {770186},
     zbl = {0559.90090},
     language = {en},
     url = {http://www.numdam.org/item/RO_1984__18_3_203_0/}
}