Basu, C.K., B.M. Uzzal Afsan, and S.S. Mandal. “Degeneracy of Some Cluster Sets”. Italian Journal of Pure and Applied Mathematics 28 (July 19, 2011): 63–78. Accessed July 18, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6014.