González-Velasco, C.; Feito-Ruiz, I.; González-Fernández, M.; Álvarez-Arenal, J.-L.; Sarmiento-Alonso, N. Does the teaching-learning model based on the flipped classroom improve academic results of students at different educational levels?. Rev. complut. educ 2021, 32 ,1, 27-39. https://doi.org/10.5209/rced.67851.