CITATION STYLE
Reiss, K., Lindmeier, A. M., Barchfeld, P., & Sodian, B. (2013). Developing Problem Solving Skills in Elementary School. In Proficiency and Beliefs in Learning and Teaching Mathematics (pp. 33–49). SensePublishers. https://doi.org/10.1007/978-94-6209-299-0_4
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