Ding, Guoli, Chanun Lewchalermvongs, and John Maharry. “Graphs With No $\bar P_7$-Minor”. The Electronic Journal of Combinatorics 23, no. 2 (April 15, 2016): P2.16. Accessed March 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i2p16.