NGAN HA, Nguyen.
 Assessment of Current Plant Diversity in Phia Oac - Phia Den Nature Reserve, Nguyen Binh District,  Cao Bang Province, Vietnam.
<strong>VNU Journal of Science: Earth and Environmental Sciences</strong>, [S.l.], v. 33, n. 1S, nov. 2017.
ISSN 2588-1094.
Available at: &lt;<a href="https://js.vnu.edu.vn/EES/article/view/4137" target="_new">https://js.vnu.edu.vn/EES/article/view/4137</a>&gt;. Date accessed: 20 apr. 2024.
doi: <a href="https://doi.org/10.25073/2588-1094/vnuees.4137">https://doi.org/10.25073/2588-1094/vnuees.4137</a>.