Hassan H, Tahir A. Developing the Third Order Linear and Nonlinear Fuzzy Ordinary Differential Equations in Hilbert Space by the Extension Principle. USci [Internet]. 2023 Sep. 30 [cited 2026 Jun. 7];2(3):71-5. Available from: https://publications.umyu.edu.ng/scientifica/index.php/usci/article/view/373