@article{RO_1972__6_3_41_0,
     author = {Tapiero, Charles S.},
     title = {K-class assignments},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {41--44},
     publisher = {EDP-Sciences},
     volume = {6},
     number = {V3},
     year = {1972},
     mrnumber = {325469},
     zbl = {0249.90049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RO_1972__6_3_41_0/}
}