Feitosa, Soraya de Araújo, Héctor José García Mendoza, and Oscar Tintorer Delgado. “Contributions of the Galperin, Talízina and Majmutov to Didactic System through the Student Problem Situations Activity in the Learning of Mathematics in Elementary School Students”. Obutchénie. Revista de Didática e Psicologia Pedagógica 6, no. 2 (August 29, 2022): 456–475. Accessed December 6, 2025. https://seer.ufu.br/index.php/Obutchenie/article/view/66644.