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<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/954" target="_new">https://js.vnu.edu.vn/MaP/article/view/954</a>&gt;. Date accessed: 22 nov. 2024.