Kanno, Jinko, and Songling Shan. “Vizing’s 2-Factor Conjecture Involving Toughness and Maximum Degree Conditions”. The Electronic Journal of Combinatorics 26, no. 2 (May 3, 2019): P2.17. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v26i2p17.