Okamoto Kyoichi, Komoriya Tomoe, Toyama Takeshi, Hirano Hirosuke, Garcia Teodinis, Baccay Melito, Macasilhig Marjun, and Fortaleza Benedicto. “PURIFICATION EXPERIMENTS ON THE PASIG RIVER, PHILIPPINES USING A CIRCULATION-TYPE PURIFICATION SYSTEM”. GEOMATE Journal, vol. 16, no. 54, Feb. 2021, pp. 49-54, https://geomatejournal.com/geomate/article/view/2624.