Pakpahan, Romauli, Richard Frimpong Oppong, Riada Mareny, and Josep Lubis. “ THE EFFECT OF CUSTOMER WATER METER CALIBRATION IN CONTROLLING LOSS LEVELS NON-PHYSICAL WATER TIRTAULI PDAM TOZAI INDAH LAMA RESIDENTIAL AREA PEMATANGSIANTAR CITY”. International Conference on Health Science, Green Economics, Educational Review and Technology 2 (December 31, 2020): 1–12. Accessed May 8, 2026. https://proceeding.unefaconference.org/index.php/IHERT/article/view/10.