@article{IVM_1981_5_a3,
     author = {R. V. Freivald},
     title = {Possibilities of various models of one-sided probabilistic automata},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {26--34},
     year = {1981},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1981_5_a3/}
}