Zamorano Urrutia, Francisco Javier, Catalina Cortés Loyola, and Mauricio Herrera Marín. 2019. “A Tangible User Interface to Facilitate Learning of Trigonometry”. International Journal of Emerging Technologies in Learning (iJET) 14 (23):pp. 152-164. https://doi.org/10.3991/ijet.v14i23.11433.