Hussain, Shah, Asma Khalid, Saira Javed, and Ilyas Khan. “Stochastic SEIR Model With Two Infectious Classes Under Environmental Variability: Well-Posedness, Extinction Persistence Thresholds, and Milstein Based 3D Simulations”. Contemporary Mathematics 6, no. 6 (November 6, 2025): 8128–8145. Accessed January 1, 2026. https://ojs.wiserpub.com/index.php/CM/article/view/8833.