Ong Van Tuyen, and Nguyen Van Trung Tin. “THE FIRST COUNTABLE PROPERTY OF RECTIFIABLE SUBSPACES”. UED Journal of Social Sciences, Humanities and Education 7, no. 2 (June 29, 2017): 16-18. Accessed May 20, 2024. https://jshe.vn/index.php/jshe/article/view/762.