Colin de Verdière Éric, Kaluža V, Paták P, Patáková Z, Tancer M. A Direct Proof of the Strong Hanani-Tutte Theorem on the Projective Plane. JGAA [Internet]. 2017 Oct. 1 [cited 2024 Jun. 30];21(5):939-81. Available from: https://jgaa.info/index.php/jgaa/article/view/paper445