@article{10_21136_CPM_1981_108282,
     author = {Cao Quy\^e't Th\u{a}'ng},
     title = {On quasi-homomorphisms and compositions of automata},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {31--37},
     publisher = {mathdoc},
     volume = {106},
     number = {1},
     year = {1981},
     doi = {10.21136/CPM.1981.108282},
     mrnumber = {613702},
     zbl = {0513.68050},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.108282/}
}