Xu P, Huiqiu L, Fang L. Long Cycles and Spectral Radii in Planar Graphs. Electron. J. Combin. [Internet]. 2025May13 [cited 2026Apr.19];32(2):#P2.26. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i2p26