K. Ponnammal, R. Sayeelakshmi. Numerical solution of generalised Pantograph equation using natural continuous extension fourth order Runge-Kutta method. Malaya J. Mat. [Internet]. 2019 Jul. 1 [cited 2024 Jul. 16];7(03):545-9. Available from: https://www.malayajournal.org/index.php/mjm/article/view/750