1. Gantmacher, F. R.,The Theory of Matrices, New York: Chelsea Publishing Company, 1959.
2. Forney, G. D., Convolution codes (I): Algebraic structure,IEEE Trans. on Information Theory, 1970, 16(6): 720.
3. Olson, R. R., Note on feedforward inverses for linear sequential circuits,IEEE Trans. on Computer, 1970, 19 (12): 1216.
4. Tao Jen-chi, Invertible linear finite automata,Scientia, 1973, 16(4): 565;Scientia Sinica (in Chinese), 1973, 16(4):454.
5. Tao Renji,Invertibility of Finite Automata, Beijing: Science Press, 1979.