Syamsudhuha, S., M. Imran, A. Putri, and R. Marjulisa. “A New Slope Averaging Technique in Heun’s Method: Combining Harmonic and Root Mean Square Means”. Journal of the Indonesian Mathematical Society, vol. 32, no. 3, Sept. 2026, p. 1813, doi:10.22342/jims.v32i3.1813.