N. Guarín-Zapata, A. M. González Cotes, and A. Patiño-Orozco, “Observe the time with this sundial”, Rev. DyC. EAFIT, vol. 59, no. 180, Oct. 2025, Accessed: Nov. 11, 2026. Available: https://publicaciones.eafit.edu.co/index.php/revista-universidad-eafit/article/view/8479