References
Álvarez, Alejandra (2017a). Conservación de área [GeoGebra Book]. In ggbm.at/MUh7Pzz8
Álvarez, Alejandra (2017b).Tangram triangular [GeoGebra Dynamic Worksheet]. In ggbm.at/VnzCkpQh
Benitez, Susana. (2017). Translation and rotation of flat figures [GeoGebra Book]. In ggbm.at/UW2gfeFH
de Jesús, Álvaro. (2017). Circumference and circle [GeoGebra Book]. In ggbm.at/gk97hyVa
Hermenegildo, Diana. (2017). Calculation of areas of flat figures [GeoGebra Book]. In ggbm.at/vUN3zyhf