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1. Experimental studies in the use of abstract and concrete concepts in problem solving / [by] B. Persson, I. Werdelin and Kristina Wimo.

by Persson, B.

Material type: book Book; Format: print Publisher: Malmo : Dept. of Educational & Psychological Research, School of Education, 1968Availability: No items available

2. Experimental studies in the use of abstract and concrete concepts in problem solving / [by] B. Persson, I. Werdelin and Kristina Wimo.

by Persson, B.

Material type: book Book; Format: print Publisher: Malmo : Dept. of Educational & Psychological Research, School of Education, 1968Availability: No items available