Ansari, A. and Chaudhry, V. (2012) “On Köthe-Toeplitz duals of some new and generalized difference sequence spaces”, Italian Journal of Pure and Applied Mathematics, 29, pp. 135–148. Available at: https://journals.uniurb.it/index.php/ijpam/article/view/6049 (Accessed: 18 July 2026).