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A four-level framework for identifying and classifying stud..:

Grayson, Diane J ; Anderson, Trevor R ; Gail, L. Crossley
International journal of science education.  23 (2001)  6 - p. 611-622 , 2001
Exemplar:  Zentrale:E03 z pae 638 j/734; Zentrale:Magazin Zs fe 1734