Solovieva, Yulia, and Luis Quintanar. “Mental Actions and the Problems of Their Formation by Stages: Following Galperin and Talizina ”. Obutchénie. Revista de Didática e Psicologia Pedagógica 4, no. 1 (August 3, 2020): 59–85. Accessed December 17, 2025. https://seer.ufu.br/index.php/Obutchenie/article/view/56472.