Saad Shakir Mahmoud, & Noor Qasim Ali. (2020). Extended B-spline approach by using continuous least square approximation. مجلة المستنصرية للعلوم والتربية, 17(5), 253–262. استرجع في من https://edumag.uomustansiriyah.edu.iq/index.php/mjse/article/view/74