@article{KYB_1970__6_2_a2,
     author = {\v{C}ul{\'\i}k, Karel II},
     title = {$n$-ary grammars and the description of mapping of languages},
     journal = {Kybernetika},
     pages = {--117},
     publisher = {mathdoc},
     volume = {06},
     number = {2},
     year = {1970},
     mrnumber = {0272563},
     zbl = {0194.31602},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1970__6_2_a2/}
}