VAN, Nguyen Thanh.
 The extention problem for a linear system of partial differential equations with function coefficients.
<strong>VNU Journal of Science: Natural Sciences and Technology</strong>, [S.l.], v. 16, n. 3, sep. 2000.
ISSN 2588-1140.
Available at: &lt;<a href="https://js.vnu.edu.vn/NST/article/view/3434" target="_new">https://js.vnu.edu.vn/NST/article/view/3434</a>&gt;. Date accessed: 15 may 2024.