@article{10_1017_S0008439500029179,
     author = {Kaufman, H.},
     title = {Algebraic structure theory of sequential machines, by {J.} {Hartmanis} and {R.} {E.} {Stearns} {Prentice-Hall,} {Inc.,} {Englewood} {Cliffs,} {N.} {J.,} 1966. viii + 211 pages . $11.50.},
     journal = {Canadian mathematical bulletin},
     pages = {324--324},
     year = {1968},
     volume = {11},
     number = {2},
     doi = {10.1017/S0008439500029179},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500029179/}
}