Rupali S. Jain, and M. B. Dhakne. “On Mild Solutions of Nonlocal Semilinear Impulsive Functional Integro-Differential Equations of Second Order”. International Journal of Mathematics And Its Applications, vol. 3, no. 4 - A, Dec. 2015, pp. 15-22, https://ijmaa.in/index.php/ijmaa/article/view/482.