Abduganiyevna, Kulmirzayeva Gulrabo, and Muhammad Alvan Rizki. “Differential Equations TUTORIAL For Lecture and for Practical Exercise”. Umsida Press (June 11, 2024): 1 - 212. Accessed July 3, 2024. https://press.umsida.ac.id/index.php/umsidapress/article/view/978-623-464-095-3.