Lavalesh Pratap Singh, Adya Shakti Rai. Visually Challenged Students’ Proficiency in the Use of Abacus. jie [Internet]. 2024 Dec. 9 [cited 2025 Jan. 9];40(2):p.91-98. Available from: http://45.127.197.188:8090/index.php/jie/article/view/1656