Santoso, I. H., Katias, P., Herlambang, T., Anshori, M. Y. and Adinugroho, M. (2023) “Implementation Fuzzy and Extended Kalman Filter for Estimation of High and Low Stock Price Travel Company”, Pattimura International Journal of Mathematics (PIJMath), 2(1), pp. 17-24. doi: 10.30598/pijmathvol2iss1pp17-24.