Rachmawardani, Agustina, et al. “Characterization of MQ-2, MQ-7 and MQ-135 Gas Sensors for Arduino-Based Smoke Detection”. Prisma Sains : Jurnal Pengkajian Ilmu Dan Pembelajaran Matematika Dan IPA IKIP Mataram, vol. 14, no. 3, June 2026, pp. 1718-32, doi:10.33394/j-ps.v14i3.21385.