Geodesic
A Direct Proof of the Strong Hanani-Tutte Theorem on the Projective Plane
Journal of Graph Algorithms and Applications, Special issue on Selected papers from the Twenty-fourth International Symposium on Graph Drawing and Network Visualization, GD 2016 , Tome 21 (2017) no. 5, pp. 939-981.

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We reprove the strong Hanani-Tutte theorem on the projective plane. In contrast to the previous proof by Pelsmajer, Schaefer and Stasi, our method is constructive and does not rely on the characterization of forbidden minors, which gives hope to extend it to other surfaces.
DOI : 10.7155/jgaa.00445
Keywords: graph drawing, graph embedding, Hanani--Tutte theorem, projective plane, topological graph theory 
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Éric Colin de Verdière; Vojtěch Kaluža; Pavel Paták; Zuzana Patáková; Martin Tancer. A Direct Proof of the Strong Hanani-Tutte Theorem on the Projective Plane. Journal of Graph Algorithms and Applications, 
							Special issue on Selected papers from the Twenty-fourth International Symposium on Graph Drawing and Network Visualization, GD 2016
					, Tome 21 (2017) no. 5, pp. 939-981. doi : 10.7155/jgaa.00445. http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00445/

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