4Paas F, Van Merrienboer J. Variability of worked examples and transfer of geometrical problem - solving skills: A cognitive - load approach. Journal of Educational Psychology, 1994,86 : 122 - 133.
5Reed S K, Bolstad C A. Use of examples and procedures in problem solving. Journal of Experimental Psychology:Learning, Memory, and Cognition, 1991,7:753 - 766.
6Ross B. Distinguishing types of superficial similarities:Different effects on the access and use of earlier problems.Journal of Experimental Psychology: Learning, Memory,and Cognition, 1989,15 (3) : 456- 468.
7Gentner E, Rattermann M J, Forbus K D. The roles of similarity in transfer:Separating retrievability from inferential soundness. Cognitive Psychology, 1993, 25:431- 467.
8Reeves L M , Weisberg R W. The role of content and abstract information in analogical transfer. Psychological Bulletin, 1994,115 (3) :381 - 400.
9Gick M L, Holyoak K J. Schema induction and analogical transfer. Cognitive Psychology,1983, 15 : 1 - 38.
10Catrambone R, Holyoak K J. Learning and subgoals and methods for solving probability problems. Memory & Cognition, 1990,18, 593 - 603.
