Kumari, M. S., H. Y. Shrivalli, and B. Mallikarjuna. “Natural Cubic Spline for Hyperbolic Equation With Constant Coefficients”. Communications in Mathematics and Applications, vol. 16, no. 1, Aug. 2025, pp. 127-41, https://www.journals.rgnpublications.com/index.php/cma/article/view/2946.