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2. Effectiveness of Japan's extended/night child care: A five-year follow up
3. Balduzzi L. Lazzari A. Van Laere K. Boudry C. Režek M. Mlinar M. &McKinnon E.(2019).Literature review on transitions across early childhood and compulsory school settings in Europe. ERI.
4. Basic Education Act(628/1998).http://www.finlex.fi/en/laki/kaannokset/1998/en19980628.pdf