@article{KYB_1969_5_3_a0,
     author = {Kostolansk\'y, Eduard},
     title = {Comments on effective and unambiguous context-free languages},
     journal = {Kybernetika},
     pages = {181--185},
     year = {1969},
     volume = {5},
     number = {3},
     mrnumber = {0243957},
     zbl = {0181.30902},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1969_5_3_a0/}
}