HUONG, Duong Thi.
 A Simple Proof for a Theorem of Nagel and Schenzel.
<strong>VNU Journal of Science: Mathematics - Physics</strong>, [S.l.], v. 33, n. 4, dec. 2017.
ISSN 2588-1124.
Available at: &lt;<a href="https://js.vnu.edu.vn/MaP/article/view/4249" target="_new">https://js.vnu.edu.vn/MaP/article/view/4249</a>&gt;. Date accessed: 27 sep. 2024.
doi: <a href="https://doi.org/10.25073/2588-1124/vnumap.4249">https://doi.org/10.25073/2588-1124/vnumap.4249</a>.