Ghorbani E, Koolen JH, Yang JY. Bounds for the Hückel Energy of a Graph. Electron. J. Combin. [Internet]. 2009Nov.7 [cited 2026Apr.29];16(1):#R134. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1r134