%0 Journal Article %A Cao Quyê't Thă'ng %T On quasi-homomorphisms and compositions of automata %J Časopis pro pěstování matematiky %D 1981 %P 31-37 %V 106 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.108282/ %R 10.21136/CPM.1981.108282 %G en %F 10_21136_CPM_1981_108282