Divya R, Chithra Devi P. Harmonious colouring of line graph of commuting and non-commuting graph of D_{2n}. Serdica Math. J. [Internet]. 2023 Dec. 7 [cited 2026 Oct. 25];48(4):271–278. Available from: https://serdica.math.bas.bg/index.php/serdica/article/view/54