PENGUKURAN TOTAL COLIFORM OULET IPAL LABORATORIUM DINAS LINGKUNGAN HIDUP PROVINSI SUMATERA BARAT MELALUI METODE MPN. Trigonometri [Internet]. 2025 Dec. 29 [cited 2026 Oct. 2];8(1):1011-20. Available from: https://cibjournal.com/index.php/trigonometri/article/view/5010