N. W. Harahap, Q. H. Lubis, R. S. Pasaribu, and T. J. Sihombing, “Application of Double Integral in Calculating the Volume of a Paraboloid-Shaped Pot Using MATLAB”, Jurnal Matematika Pelita Cahaya Indonesia, vol. 1, no. 1, pp. 1–8, Jan. 2026.