@article{KYB_1967_3_6_a1,
     author = {\v{C}ul{\'\i}k, Karel II},
     title = {Sequential machines with several input and output tapes},
     journal = {Kybernetika},
     pages = {540--559},
     year = {1967},
     volume = {3},
     number = {6},
     zbl = {0155.02001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1967_3_6_a1/}
}