POWELL, Arthur B.; ALQAHTANI, Muteb M. TASKS AND META-TASKS TO PROMOTE PRODUCTIVE MATHEMATICAL DISCOURSE IN COLLABORATIVE DIGITAL ENVIRONMENTS. The Eurasia Proceedings of Educational and Social Sciences, [S. l.], v. 2, p. 254–263, 2015. Disponível em: https://www.epess.net/index.php/epess/article/view/125. Acesso em: 18 jul. 2025.