1.
Bhattacharyya J, Basnet DK. Formal triangular matrix ring with nil clean index 4. J. Assam Acad. Math. [Internet]. 2023 Dec. 31 [cited 2024 May 18];13:1-4. Available from: https://jaam.aamonline.org.in/ojs/index.php/j/article/view/60