Belbase, Shashidhar. 2018. “Objectual Beliefs of Two Preservice Mathematics Teachers about Teaching Geometric Transformations With geometer’s Sketchpad”. Revista Internacional De Pesquisa Em Educação Matemática 8 (1). Brasília:38-59. https://sbembrasil.org.br/periodicos/index.php/ripem/article/view/1432.