@article{M2AN_1968__2_1_71_0,
     author = {Robert, Pierre and Ferland, Jacques},
     title = {G\'en\'eralisation de l'algorithme de {Warshall}},
     journal = {Revue fran\c{c}aise d'informatique et de recherche op\'erationnelle},
     pages = {71--85},
     publisher = {Dunod},
     address = {Paris},
     volume = {2},
     number = {R1},
     year = {1968},
     mrnumber = {234770},
     zbl = {0172.20601},
     language = {fr},
     url = {http://archive.numdam.org/item/M2AN_1968__2_1_71_0/}
}