@article{KYB_1967_3_3_a1,
     author = {Arbib, Michael},
     title = {Tolerance automata},
     journal = {Kybernetika},
     pages = {223--233},
     year = {1967},
     volume = {3},
     number = {3},
     mrnumber = {0223185},
     zbl = {0153.01201},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1967_3_3_a1/}
}