Siahaan, Meiva Marthaulina Lestari, et al. “Learning Trajectory: Learning Design Based on Rigorous Mathematical Thinking to Enhance Students’ Mathematical Conceptual”. Edumatica : Jurnal Pendidikan Matematika, vol. 16, no. 2, Aug. 2026, pp. 339-5, https://doi.org/10.22437/edumatica.v16i2.49776.