Published in
Extended Education from an International Comparative Point of View, p. 39-53, 2019
DOI: 10.1007/978-3-658-27172-5_4
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Extended Education Offerings and Students’ Development of School Achievement
Book chapter published in 2019 by
Marianne Schüpbach,
Benjamin von Allmen,
Lukas Frei,
Wim Nieuwenboom 
