Castro, Juscileide, 		Freitas, Francisco, 		Rufino, Lidya, 		Sousa, Joyce, 		Oliveira, Rayssa, 		Gomes, Nassara, 		Medeiros, Márcia, AND 		Castro Filho, José.
" Island of Operations: a digital educational resource with multiple representations for understanding the additive field" <em>Companion Proceedings of the Brazilian Congress on Computers in Education (CBIE)</em> [Online], (24 November 2020)