Núñez, I.B. and Ramalho, B.L. (2017) “The theory of the planned formation of the Mental Actions and the Concepts of P. Ya. Galperin: contributions to the Developmental Didactics”, Obutchénie. Revista de Didática e Psicologia Pedagógica, 1(1), pp. 70–97. doi:10.14393/OBv1n1a2017-4.