@article{MASLO_1966_16_1_a8,
     author = {Gruska, Jozef},
     title = {Two {Operations} with {Formal} {Languages} and their {Influence} upon {Structural} {Unambiguity}},
     journal = {Mathematica slovaca},
     pages = {58--65},
     year = {1966},
     volume = {16},
     number = {1},
     mrnumber = {0245388},
     zbl = {0143.25701},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1966_16_1_a8/}
}