D. Dürrschnabel, and G. Stumme. (2021)cite arxiv:2102.02684Comment: 16 pages, 6 figures, 4 algorithms, for source code refer to https://github.com/domduerr/redraw.
G. Bergman. (2016)cite arxiv:1602.00034Comment: Comments: 50 pages. Main change from version 2: Lemma 26 strengthened to include contractibility statement which in previous version was noted as "likely" in paragraph following that result. Several small typoes also corrected.
T. Hanika, F. Schneider, and G. Stumme. Accepted for publication in: Tohoku Mathematical Journal, (2020)cite arxiv:1801.07985Comment: v2: completely rewritten 28 pages, 3 figures, 2 tables.