Ninh, L., 		Bang, N., 		Hang, N., 		Phuong, T., & 		Trung, N.
(2009).
 The establishment of the Vietnam atomic time scale.
<em>VNU Journal Of Science: Mathematics - Physics, 25</em>(2).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/2638" target="_new">https://js.vnu.edu.vn/MaP/article/view/2638</a>