THUY, Nguyen Xuan.
 Concerning semi-quotient mappings.
<strong>VNU Journal of Science: Mathematics - Physics</strong>, [S.l.], v. 28, n. 2, june 2012.
ISSN 2588-1124.
Available at: &lt;<a href="https://js.vnu.edu.vn/MaP/article/view/952" target="_new">https://js.vnu.edu.vn/MaP/article/view/952</a>&gt;. Date accessed: 27 apr. 2025.