Arinto Yudi Ponco Wardoyo, Hari Arief Dharmawan, Muhammad Nurhuda, and Arif Budianto. “ULTRAFINE PARTICLE FILTER DESIGN FOR MOTORCYCLE EMISSION EXHAUST SYSTEM: A HIGH VOLTAGE ELECTROSTATIC-BASED SYSTEM”. GEOMATE Journal, vol. 18, no. 67, Mar. 2020, pp. 57-62, https://geomatejournal.com/geomate/article/view/484.