Budianto, Arif, et al. “A Development of a Coarse Particle Concentration Measurement System Using a Crystal-Based Sensor and a Dust Sensor for Air Quality Measurement”. Jurnal Pendidikan Fisika Dan Teknologi, vol. 10, no. `1, June 2024, pp. 10-15, doi:10.29303/jpft.v10i`1.6692.