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"E-Chalk: a lecture recording system using the chalkboard metaphor."
Gerald Friedland et al. (2004)
- Gerald Friedland, Lars Knipping, Joachim Schulte, Ernesto Tapia:
E-Chalk: a lecture recording system using the chalkboard metaphor. Interact. Technol. Smart Educ. 1(1): 9-20 (2004)

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