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Kaiser, Gabriele ORCID: 0000-0002-6239-0169, Benthien, J., Döhrmann, Martina and König, Johannes ORCID: 0000-0003-3374-9408 (2013). Expert Ratings as an Instrument for Validating Results of Video-Based Testing. In: Proceedings of the 37th Conference of the International Group for the Psychology of Mathematics Education PME in Kiel/Germany, p. 83. PME. ISBN 978-3-89088-287-1