@article{Whitefield, author = {Whitefield, J. W.}, title = {An Experiment in Problem Solving, in :}, series = {Warson, P. C., Johnson-Laird, P. N. (Eds.): Thinking and Reasoning, Harmondsworth (Penguin Books) 1968, pp. 193-210.}, journal = {Warson, P. C., Johnson-Laird, P. N. (Eds.): Thinking and Reasoning, Harmondsworth (Penguin Books) 1968, pp. 193-210.}, language = {en} }