Caballero Vigil L, Jaramillo H. RI, Villarreal B. DE. Numerical relations: mathematics in the digits of the year 2020. Rev. cient. Guacamaya [Internet]. 2020 Oct. 6 [cited 2024 May 19];5(1):86-9. Available from: https://revistas.up.ac.pa/index.php/guacamaya/article/view/1783