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Cai, J., Morris, A., Hohensee, C., Hwang, S., Robison, V., Cirillo, M., Kramer, S. L., Hiebert, J., & Bakker, A. (2020). Addressing the Problem of Always Starting Over: Identifying, Valuing, and Sharing Professional Knowledge for Teaching, Journal for Research in Mathematics Education, 51(2), 130-139. Retrieved Jul 5, 2020, from