This course was written by Anja Schaefer.
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Section 6: ‘A brief introduction to Schaefer Kalk’: Adapted from Schaefer Kalk (2010) A brief Introduction to Schaefer Kalk. © 2010 Schaefer Kalk GmbH & Co. KG
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Section 6, Schaefer Kalk case study: © The Open University
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