@article{RO_1978__12_1_93_0,
     author = {Kaio, Naoto and Osaki, Shunji},
     title = {Optimum ordering policies when order costs depend on time},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {93--99},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {1},
     year = {1978},
     mrnumber = {484337},
     zbl = {0379.90049},
     language = {en},
     url = {http://www.numdam.org/item/RO_1978__12_1_93_0/}
}