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Computer-based science instruction : [proceedings of the NATO Advanced Study Institute on Computer-Based Science Instruction, Louvain-la-Neuve, Belgium, 19-30 July 1976]. pp.269-286, 1977. Leyden. Noordhoff International Publising
Computer-based science instruction : [proceedings of the NATO Advanced Study Institute on Computer-Based Science Instruction, Louvain-la-Neuve, Belgium, 19-30 July 1976]. pp.1-3, 1977. Leyden. Noordhoff International Publising