Vargas, A., 		Santos, R., 		Neves, M., 		Teixeira, D., & 		Botelho, S.
(2020).
 ELO based recommendation system for precalculus: An experiment with freshmen students.
In <em>Proceedings of the 31st Brazilian Symposium on Computers in Education</em>, (pp. 1213-1222). Porto Alegre: SBC.
doi:10.5753/cbie.sbie.2020.1213