@article{CMUC_1964__5_2_a3,
     author = {\v{C}ul{\'\i}k, Karel},
     title = {On equivalent and similar grammars of {Algol-like} languages {(Preliminary} communication)},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {93--95},
     publisher = {mathdoc},
     volume = {05},
     number = {2},
     year = {1964},
     mrnumber = {0167351},
     zbl = {0129.10212},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1964__5_2_a3/}
}