First-Order Definable Retraction Problems for Posets and Reflexive Graph

Víctor Dalmau, Andrei A. Krokhin, Benoit Larose. First-Order Definable Retraction Problems for Posets and Reflexive Graph. In 19th IEEE Symposium on Logic in Computer Science (LICS 2004), 14-17 July 2004, Turku, Finland, Proceedings. pages 232-241, IEEE Computer Society, 2004. [doi]

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