V. Muthulakshmi, and R. Manjuram. “Interval Oscillation Criteria for Second-Order Forced Delay Differential Equation With Riemann-Stieltjes Integral”. International Journal of Mathematics And its Applications 6, no. 1 - B (January 20, 2018): 281–295. Accessed July 3, 2024. https://ijmaa.in/index.php/ijmaa/article/view/924.