Lebid’, V.O. and Nizhnik, L.P. (2014) “Spectral Analysis of Some Graphs with Infinite Rays”, Ukrains’kyi Matematychnyi Zhurnal, 66(9), pp. 1193–1204. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2210 (Accessed: 5 December 2025).