@article{DMGAA_2005_25_1_a5,
     author = {Woryna, Adam},
     title = {Representations of a free group of rank two by time-varying {Mealy} automata},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {119--134},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2005_25_1_a5/}
}