NINH, Le Van et al.
 The establishment of the Vietnam atomic time scale.
<strong>VNU Journal of Science: Mathematics - Physics</strong>, [S.l.], v. 25, n. 2, june 2009.
ISSN 2588-1124.
Available at: &lt;<a href="https://js.vnu.edu.vn/MaP/article/view/2638" target="_new">https://js.vnu.edu.vn/MaP/article/view/2638</a>&gt;. Date accessed: 19 may 2024.