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Instructional Science > 2002 > 30 > 5 > 335-359
Knowledge and Information Systems > 2000 > 2 > 4 > 498-508
Computers & Industrial Engineering > 1999 > 37 > 1-2 > 421-424
Instructional Science > 2002 > 30 > 5 > 335-359
Knowledge and Information Systems > 2000 > 2 > 4 > 498-508
Computers & Industrial Engineering > 1999 > 37 > 1-2 > 421-424