@article{CMUC_1973_14_4_a3,
     author = {Chytil, Michal P.},
     title = {On changes of input/output coding. {I}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {623--645},
     year = {1973},
     volume = {14},
     number = {4},
     mrnumber = {0373864},
     zbl = {0268.02031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1973_14_4_a3/}
}