@article{KYB_1976_12_2_a2,
     author = {Zech, Karl-Adolf},
     title = {On networks of non-deterministic automata},
     journal = {Kybernetika},
     pages = {86--102},
     year = {1976},
     volume = {12},
     number = {2},
     mrnumber = {0434675},
     zbl = {0329.94028},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1976_12_2_a2/}
}