Djebbar Samir, Belaib Lekhmissi, and Hadadine Mohamed Zine Eddine. “Perturbation of Differential Linear System”. Malaya Journal of Matematik 4, no. 04 (October 1, 2016): 519–523. Accessed December 4, 2024. https://www.malayajournal.org/index.php/mjm/article/view/566.