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2. Eriksson, G. (2004b). Tidig aritmetisk kunskapsbildning. Ett specialpedagogiskt perspektiv. [Knowledge building in early arithmetic for children with special needs]. In: A. Engström (Ed.), Democracy and Participation a Challenge for Special Needs Education in Mathematics. Proceedings of the 2nd Nordic Research Conference on Special Needs Education in Mathematics (pp. 149–161). Reports No. 7 from the Department of Education. Örebro: Örebro University.
3. Eriksson, G. (2005a). Tidig aritmetisk kunskapsbildning. Ett radikalkonstruktivistiskt perspektiv. [Early arithmetic knowledge building from the perspective of radical constructivism.] Doktorsavhandling [Doctoral dissertation]. Studies in Educational Sciences, 76, Stockholm HLS förlag Institute of Education.
4. En inkluderande undervisning i matematik-Vad kan det innebära? [Including education in mathematics – What could it mean?];Eriksson,2005
5. Duality, ambiguity, and flexibility: A “Proceptual” view of simple arithmetic;Gray;Journal for Research in Mathematics Education,1994