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<strong>VNU Journal of Science: Mathematics - Physics</strong>, [S.l.], v. 27, n. 3, sep. 2011.
ISSN 2588-1124.
Available at: &lt;<a href="https://js.vnu.edu.vn/MaP/article/view/1524" target="_new">https://js.vnu.edu.vn/MaP/article/view/1524</a>&gt;. Date accessed: 18 may 2024.