@article{KYB_1968_4_2_a0,
     author = {\v{C}ul{\'\i}k, Karel},
     title = {Some theorems on labelled bracketings used in transformational grammars},
     journal = {Kybernetika},
     pages = {87--92},
     year = {1968},
     volume = {4},
     number = {2},
     zbl = {0157.02001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1968_4_2_a0/}
}