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Kumar, V., Greer, J. E., & McCalla, G. I. (2005). Assisting online helpers. International journal of learning technology, 1(3), 293–321.
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Bagheri, E., & Ghorbani, A.A. (2009). Astrolabe: A Collaborative Multi-Perspective Goal-oriented Risk Analysis Methodology. IEEE Transactions on Systems, Man and Cybernetics, Part A: Systems and Humans, 39(1), 66–85.
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Willis, A., & Connors, M. (1994). Astronomy 200 Introduction to Astronomy and Astrophysics I Student Manual.16.
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Willis, A., & Connors, M. (1995). Astronomy 200 Introduction to Astronomy and Astrophysics I Study Guide.138.
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Connors, M. (1997). Astronomy 200 Introduction to Astronomy and Astrophysics I Supplementary Laboratory.
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