[1] T. M. Apostol, Introduction to Analytic Number Theory, Springer Science and Business Media, 2013.
[2] J. B. Babujee, Euler’s phi function and graph labeling, Int. J. Contemp. Math. Sci, 5 No. 20 (2010) 977-984.
[3] T. Chalapathi and R. Kumar, Graph structures of Euler totient numbers, DIUJST, 11 No. 2 (2016) 19-29.
[4] N. Ghanbari and S. Alikhani, A graph related to the Euler ϕ function, Math. Gaz., 107 No. 569 (2023) 263-272.
[5] F. Harary, Graph Theory (on Demand Printing of 02787), CRC Press, 2018.
[6] Y. Kaneda, J.D. Laison, J. Schreiner-McGraw and C. Starr, Prime power and prime product distance graphs, Discrete Appl. Math., 255 (2019) 334-338.
[7] S. Shanmugavelan, The Euler function graph G (ϕ(n)), Int. J. Pure Appl. Math, 116 (2017) 45-48.
[8] S. Shanmugavelan and C. Natarajan, On Divisor Function Even (Odd) Sum Graphs, In In Nonlinear Dynamics and Applications: Proceedings of the ICNDA 2022, Springer International Publishing, 2022.