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Samuelsson, Ingrid Pramling; Carlsson, Maj Asplund . (2008). The Playing Learning Child: Towards a pedagogy of early childhood. Scandinavian Journal of Educational Research, 52(6), 623–641. doi:10.1080/00313830802497265 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research