HUNG, Van Phu et al.
 Application of Principal Component Analysis  in Determining the Hydrogeochemistry Characteristics  of Karst Water in Bac Kan and Cao Bang.
<strong>VNU Journal of Science: Earth and Environmental Sciences</strong>, [S.l.], v. 40, n. 2, may 2024.
ISSN 2588-1094.
Available at: &lt;<a href="https://js.vnu.edu.vn/EES/article/view/5030" target="_new">https://js.vnu.edu.vn/EES/article/view/5030</a>&gt;. Date accessed: 24 nov. 2024.
doi: <a href="https://doi.org/10.25073/2588-1094/vnuees.5030">https://doi.org/10.25073/2588-1094/vnuees.5030</a>.