1. Developing and using symbol sense in mathematics;Arcavi;For the Learning of Mathematics,2005
2. Characterizing a classroom practice that promotes algebraic reasoning;Blanton;Journal for Research in Mathematics Education,2005
3. How to replace word problems with activities of realistic mathematical modelling;Bonotto,2007
4. Learning by understanding: The role of multiple representations in learning algebra;Brenner;American Educational Research Journal,1997
5. Mathematical proficiency: What is important? How can it be measured?;Burkhardt,2007