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Jiří Havelka (2005): Projectivity in Totally Ordered Rooted Trees: An Alternative Definition of Projectivity and Optimal Algorithms for Detecting Non-Projective Edges and Projectivizing Totally Ordered Rooted Trees. In: The Prague Bulletin of Mathematical Linguistics, ISSN 0032-6585, 84, pp. 13-30 (pdf, local PDF, bibtex)