Arif, Didik Khusnul, Helisyah Nur Fadhilah, and Prima Aditya. 2020. “Estimation of Air Pollutant Transportation Equation in Surabaya Using Kalman Filter Method”. (IJCSAM) International Journal of Computing Science and Applied Mathematics 6 (1):18-22. https://journal.its.ac.id/index.php/ijcsam/article/view/4546.