TY - JOUR A1 - Inhelder, B. A1 - Matalon, B. T1 - The Study of Problem Solving and Thinking JF - Warson, P. C., Johnson-Laird, P. N. (Eds.): Thinking and Reasoning, Harmondsworth (Penguin Books) 1968, pp. 364-379. Y1 - 1968 ER -