@article{KYB_2007__43_3_a0,
     author = {Blatn\'y, Petr and Bidlo, Radek and Meduna, Alexander},
     title = {Automata with two-sided pushdowns defined over free groups generated by reduced alphabets},
     journal = {Kybernetika},
     pages = {265--278},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {2007},
     mrnumber = {2362718},
     zbl = {1135.68027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2007__43_3_a0/}
}