Steinweg, Anna Susanne: Key ideas as guiding principles to support algebraic thinking in German primary schools
. In: Dooley, Thérèse ; Gueudet, Ghislaine (Hrsg.) : Proceedings of the Tenth Congress of the European Society for Research in Mathematics Education (CERME10, February 1-5, 2017). Dublin : DCU Institute of Education and ERME, 2017, S. 512-519. - ISBN 978-1-873769-73-7
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