Masduqi, Ali, and Erna Apriliani. “Estimation of Surabaya River Water Quality Using Kalman Filter Algorithm”. IPTEK The Journal for Technology and Science 19, no. 3 (June 30, 2025): 87–91. Accessed January 30, 2026. https://journal.its.ac.id/index.php/jts/article/view/5906.