@article{KYB_1972_8_5_a2,
     author = {Pirick\'a, Alica},
     title = {Directable automata and directly subdefinite events},
     journal = {Kybernetika},
     pages = {395--403},
     year = {1972},
     volume = {8},
     number = {5},
     mrnumber = {0396125},
     zbl = {0249.94015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1972_8_5_a2/}
}