Thomas Place, Luc Segoufin. A Decidable Characterization of Locally Testable Tree Languages. In Susanne Albers, Alberto Marchetti-Spaccamela, Yossi Matias, Sotiris E. Nikoletseas, Wolfgang Thomas, editors, Automata, Languages and Programming, 36th Internatilonal Collogquium, ICALP 2009, Rhodes, greece, July 5-12, 2009, Proceedings, Part II. Volume 5556 of Lecture Notes in Computer Science, pages 285-296, Springer, 2009. [doi]
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