WAHYUNI, Sri; 						SUPRIYANTO, Supriyanto; 						DJAYUS, Djayus.
 ESTIMASI SEBARAN KUALITAS BATUBARA (ASH CONTENT) MENGGUNAKAN METODE INVERS DISTANCE WEIGHTED (IDW) DAN ORDINARY KRIGING (OK) DI PT. KAYAN PUTRA UTAMA COAL SITE SEPARI, KALIMANTAN TIMUR.
<strong>GEOSAINS KUTAI BASIN</strong>, [S.l.], v. 2, n. 1, apr. 2019.
ISSN 2615-5176.
Available at: &lt;<a href="https://jurnal.fmipa.unmul.ac.id/index.php/geofis/article/view/330" target="_new">https://jurnal.fmipa.unmul.ac.id/index.php/geofis/article/view/330</a>&gt;. Date accessed: 19 apr. 2025.
doi: <a href="https://doi.org/10.30872/geofisunmul.v2i1.330">https://doi.org/10.30872/geofisunmul.v2i1.330</a>.