@article{10_21136_CMJ_1965_100683,
     author = {Gruska, Jozef},
     title = {Induction in formal languages. {Some} properties of reducing transformations and of isolable sets},
     journal = {Czechoslovak Mathematical Journal},
     pages = {406--415},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1965},
     doi = {10.21136/CMJ.1965.100683},
     mrnumber = {0220550},
     zbl = {0135.25201},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100683/}
}