References
Xuhua Sun
(2018). Uncovering Chinese pedagogy: spiral variation—the unspoken principle of algebra thinking used to develop chinese curriculum and instruction of the "two basics". In G. Kaiser, H. Forgasz, M. Graven, A. Kuzniak, E. Simmt, & B. Xu (Eds.). Invited lectures from the 13th international congress on mathematical education (pp. 651-667). Dordrecht: Springer.