A. R. Musa, M. L. Seplo, J. Salillas, and B. J. Lumauag, “The Development of Smart Indoor Air Purifier with Real-time Monitoring System and Interchangeable Activated Carbon Filter”, VI, vol. 8, no. 1, pp. 23–37, Aug. 2021, doi: 10.63173/z8p51d92.