K.T. Divya Mol, and Lovelymol Sebastian. “$\sigma$-Algebra of Complex Fuzzy Subgroups Associated With a Finite Group and the Measure on the $\sigma$-Algebra”. Malaya Journal of Matematik, vol. 9, no. 01, Jan. 2021, pp. 1176-80, https://www.malayajournal.org/index.php/mjm/article/view/1244.