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Two experiments using learning rate to evaluate an experimenter developed tool for splay trees. In: Proceedings of the 42nd ACM technical symposium on Computer science education. New York, NY, USA: ACM; 2011. p. 135-40. (SIGCSE '11).
Learning to program through the web. In: Proceedings of the 10th annual SIGCSE conference on Innovation and technology in computer science education. New York, NY, USA: ACM; 2005. p. 9-13. (ITiCSE '05).