Yongjin Li and Yan Shen. Hyers-Ulam Stability of Nonhomogeneous Linear Differential Equations of Second Order: A Scientific Explanation. TPMCS-V9 [Internet]. 2021 May 4 [cited 2026 Jun. 4];:94-9. Available from: https://stm.bookpi.org/TPMCS-V9/article/view/855