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Springer Science and Business Media LLC
Reference2 articles.
1. D. Jakubikova-Studenovská, “On congruence relations of monounary algebras. 1,” Czech. Math. J., 32, 37–459 (1982).
2. D. Jakubikova-Studenovská, “On congruence relations of monounary algebras 2,” Czech. Math. J., 33, 448–466 (1983).