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OBDRŽÁLEK, Jan. DAG-width - Connectivity Measure for Directed Graphs. In Proceedings of the Seventeenth Annual ACM-SIAM Symposium on Discrete Algorithms. New York/Philadelphia: Association for Computing Machinery/Society for Industrial and Applied Mathematics, 2006, s. 814--821. ISBN 0-89871-605-5.Podrobněji: https://is.muni.cz/publication/635424/cs