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@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}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1966}, mrnumber = {0245388}, zbl = {0143.25701}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1966__16_1_a8/} }
Gruska, Jozef. Two Operations with Formal Languages and their Influence upon Structural Unambiguity. Mathematica slovaca, Tome 16 (1966) no. 1, pp. 58-65. http://geodesic.mathdoc.fr/item/MASLO_1966__16_1_a8/