Sadiq, Ola Hadi. “Analysis of Ozone Concentration in Wasit Governorate – Iraq Using Fuzzy Nonparametric Regression Estimation Methods”. Khazayin of Economic and Administrative Sciences (March 30, 2026): 59–72. Accessed June 18, 2026. https://keas.uodiyala.edu.iq/index.php/kjeas/article/view/218.