1. The Design and Analysis of Computer Algorithms;Aho,1974
2. Subdirect unions in universal algebra;Birkhoff;Bull. Amer. Math. Soc.,1944
3. Fast algorithms for finding a subdirect decomposition and interesting congruences of finite algebras;Demel;Kybernetika,1982
4. On subdirectly irreducible automata;Demlová;R.A.I.R.O. Inform. Théor.,1981
5. Several algorithms for finite algebras;Demlová,1979