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Erratum to: “Putting the unit in pre-service secondary teachers’ unit circle". (English)
Educ. Stud. Math. 92, No. 2, 243 (2016).
Erratum to the authors’ paper [ibid. 92, No. 2, 221‒241 (2016; ME 2016e.00727)].
Classification: G60 G40
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