Yakar, Coşkun, and Dilara Karslıoğlu. “Variation of Parameters and Lipschitz-Type Stability in Unperturbed Differential Systems With Initial Time Difference”. International Journal of Maps in Mathematics, vol. 9, no. 2, Sept. 2026, pp. 408-27, https://simadp.com/journalmim/article/view/449.