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A. Chéritat. (2014)cite arxiv:1410.4417Comment: 16 pages, 7 figures. This version has the following changes: Added computer generated images of the key positions S1 and S2. Corrected several minor mistakes. Corrected the proof of the main proposition (I had forgotten to ensure that the top and bottom curves remain embedded during the homotopy) and slightly changed the statement of Lemma 3 to adapt.
P. Singer, F. Lemmerich, R. West, L. Zia, E. Wulczyn, M. Strohmaier, and J. Leskovec. Proceedings of the 26th International Conference on World Wide Web, page 1591--1600. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2017)
S. Bethard, and D. Jurafsky. Proceedings of the 19th ACM international conference on Information and knowledge management, page 609--618. New York, NY, USA, ACM, (2010)