References
H. Willke (1999) Systemtheorie II: Interventionstheorie Lucius & Lucius UTB Stuttgart
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Krainer, K. Editorial. J Math Teacher Educ 8, 75–81 (2005). https://doi.org/10.1007/s10857-005-4766-0
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DOI: https://doi.org/10.1007/s10857-005-4766-0