Anh, L., & 		Tung, N.
(2009).
 Some results on countably ∑-uniform - extending modules.
<em>VNU Journal Of Science: Mathematics - Physics, 25</em>(1).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/2581" target="_new">https://js.vnu.edu.vn/MaP/article/view/2581</a>