Pratomo, Danar Guruh, Khomsin Khomsin, and Dody Pambudhi. 2018. “ETEKSI IPA AWAH AUT ENGAN ATA ULTIBEAM CHOSOUNDER (Studi asus: uara ekasi)”. EOID 13 (2):115-20. https://doi.org/10.12962/geoid.v13i2.1562.