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Xian, H., & Madhavan, K. (2013). Building on and Honoring Forty Years of PBL Scholarship from Howard Barrows: A Scientometric, Large-Scale Data, and Visualization-Based Analysis. Interdisciplinary Journal of Problem-Based Learning, 7, 132-156.
http://dx.doi.org/10.7771/1541-5015.1325

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