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Thorbergsson, Gudlaugur and Umehara, Masaaki (2012). A refinement of Foreman's four-vertex theorem and its dual version. Kyoto J. Math., 52 (4). S. 743 - 759. DURHAM: DUKE UNIV PRESS. ISSN 2156-2261
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Thorbergsson, Gudlaugur and Umehara, Masaaki (2012). A refinement of Foreman's four-vertex theorem and its dual version. Kyoto J. Math., 52 (4). S. 743 - 759. DURHAM: DUKE UNIV PRESS. ISSN 2156-2261