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 2024 Nov. 24];2(3):71-5. Available from: https://scientifica.umyu.edu.ng/index.php/scientifica/article/view/236