Ivonne Milichristi Radjawane, et al. “Pelacakan Mundur Partikel Sampah Dengan Metode Euler-Lagrange Di Pelabuhan Ratu”. Limits: Journal of Mathematics and Its Applications, vol. 20, no. 3, Nov. 2023, pp. 371-9, https://journal.its.ac.id/index.php/limits/article/view/5613.