AA, Adeniji, Adeniyi MO, Shatalov MY, and Oshinubi K. “Optimal Control Model of University-PhD-Postdoc-Industry (UPPI) Migration and Unemployment”. Contemporary Mathematics 5, no. 2 (June 19, 2024): 2310–2329. Accessed July 3, 2024. https://ojs.wiserpub.com/index.php/CM/article/view/2986.