Andayani, L. et al. 2019. PENGEMBANGAN ALAT UKUR VISKOSITAS AIR SUNGAI TERCEMAR LIMBAH CAIR BERBASIS SENSOR OPTIK TIPE THROUGH BEAM. Joint Prosiding IPS dan Seminar Nasional Fisika. 8, (Dec. 2019), SNF2019–PA. DOI:https://doi.org/10.21009/03.SNF2019.02.PA.04.