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<strong>VNU Journal of Science: Mathematics - Physics</strong>, [S.l.], v. 20, n. 3, sep. 2004.
ISSN 2588-1124.
Available at: &lt;<a href="https://js.vnu.edu.vn/MaP/article/view/4144" target="_new">https://js.vnu.edu.vn/MaP/article/view/4144</a>&gt;. Date accessed: 19 may 2024.