N. M. M. Abreu, C. T. M. Vinagre, A. S. Bonif_acioa and I. Gutman, The Laplacian energy of some Laplacian integral graph, MATCH Commun. Math. Comput. Chem., 60 (2008) 447-460.
 K. Balińska, D. Cvetković, Z. Radosavljević, S. Simić and D. Stevanović, A survey on integral graphs, Univ. Beograd. Publ. Elektrotehn. Fak. Ser. Mat., 13 (2003) 42-65.
 R. Brauer and K. A. Fowler, On groups of even order, Ann. of Math., 62 No. 2 (1955) 565-583.
 D. Cvetković, P. Rowlinson, S. Simić, Signless Laplacian of finite graphs, Linear Algebra Appl., 423 (2007) 155-171.
 P. Dutta, B. Bagchi and R. K. Nath, Various energies of commuting graphs of finite nonabelian groups, Khayyam J. Math., 6 No. 1 (2020) 27-45.
 J. Dutta and R. K. Nath, Spectrum of commuting graphs of some classes of finite groups, Matematika, 33 No. 1 (2017) 87-95.
 J. Dutta and R. K. Nath, Finite groups whose commuting graphs are integral, Mat. Vesnik, 69 No. 3 (2017) 226-230.
 J. Dutta and R. K. Nath, Laplacian and signless Laplacian spectrum of commuting graphs of finite groups, Khayyam J. Math., 4 No. 1 (2018) 77-87.
 W. N. T. Fasfous, R. K. Nath and R. Sharafdini, Various spectra and energies of commuting graphs of finite rings, Hacet. J. Math. Stat., 49 No. 6 (2020) 1915-1925.
 S.C. Gong, X. Li, G.H. Xu, I. Gutman and B. Furtula, Borderenergetic graphs, MATCH Commun. Math. Comput. Chem., 74 (2015) 321-332.
 I. Gutman, Hyperenergetic molecular graphs, J. Serb. Chem. Soc., 64 (1999) 199-205.
 I. Gutman, N. M. M. Abreu, C. T. M. Vinagre, A. S. Bonifácioa and S. Radosavljević, Relation between energy and Laplacian energy, MATCH Commun. Math. Comput. Chem., 59 (2008) 343-354.
 F. Harary and A. J. Schwenk, Which graphs have integral spectra?, Graphs and Combin., Lect. Notes Math., 406 (1974), Springer-Verlag, Berlin, 45-51.
 M. Herzog, M. Longobardi and M. Maj, On a commuting graph on conjugacy classes of groups. Comm. Algebra, 37 No. 10 (2009) 3369-3387.
 S. Kirkland, Constructably Laplacian integral graphs, Linear Algebra Appl., 423 (2007) 3-21.
 J. Liu, and B. Liu, On the relation between energy and Laplacian energy, MATCH Commun. Math. Comput. Chem., 61 (2009) 403-406.
 R. Merris, Degree maximal graphs are Laplacian integral, Linear Algebra Appl., 199 (1994) 381-389.
 A. Mohammadian, A. Erfanian, D. G. M. Farrokhi and B. Wilkens, Triangle-free commuting conjugacy class graphs. J. Group Theory, 19 (2016) 1049-1061.
 R. K. Nath, Various spectra of commuting graphs n-centralizer finite groups, International Journal of Engineering Science and Technology, accepted for publication.
 M. A. Salahshour and A. R. Ashrafi, Commuting conjugacy class graph of finite CA-groups, Khayyam J. Math., 6 No. 1 (2020) 108-118.
 S. K. Simić and Z. Stanić, Q-integral graphs with edge-degrees at most five, Discrete Math., 308 (2008) 4625-4634.
 D. Stevanović, I. Stanković, and M. Milošević, More on the relation between energy and Laplacian energy, MATCH Commun. Math. Comput. Chem., 61 (2008) 395-401.
 F. Tura, L-borderenergetic graphs, MATCH Commun. Math. Comput. Chem., 77 (2017) 37-44.
 H.B. Walikar, H.S. Ramane and P.R. Hampiholi, On the energy of a graph, Graph Connections, Allied Publishers, New Delhi, 1999, pp. 120-123, Eds. R. Balakrishnan, H. M. Mulder, A. Vijayakumar.