THONGKAM, Thinikan; 						HEMAVIBOOL, Khuanjit.
 An Indirect Colorimetric Method for Potassium Determination in Soil Using a Paper Device and Smartphone.
<strong>Molekul</strong>, [S.l.], v. 17, n. 3, p. 393-400, nov. 2022.
ISSN 2503-0310.
Available at: &lt;<a href="https://jos.unsoed.ac.id/index.php/jm/article/view/6279" target="_new">https://jos.unsoed.ac.id/index.php/jm/article/view/6279</a>&gt;. Date accessed: 14 mar. 2025.
doi: <a href="https://doi.org/10.20884/1.jm.2022.17.3.6279">https://doi.org/10.20884/1.jm.2022.17.3.6279</a>.