1. Barrett, J. E. (1998). Representing, connecting and restructuring knowledge: The growth of children's understanding of length in two-dimensional space. Unpublished doctoral dissertation, Graduate School of Education, State University of New York at Buffalo.
2. Barrett, J. E. & Clements, D. H. (1996, October). Representing, connecting and restructuring knowledge: A microgenetic analysis of a child's learning in an open-ended task involving perimeter, paths, and polygons. Paper presented at the 18th annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education, Panama City, FL.
3. Bowers, J. S. & Doerr, H. M. (1998, October). Investigating teacher's insights into the mathematics of change. Paper presented at the 20th annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education, Raleigh, NC.
4. Bragg, P. & Outhred, L. (2001, July). So that's what a centimetre looks like: Students' understandings of linear units. Paper presented at the 25th International Conference on the Psychology of Mathematics Education, Utrecht, The Netherlands.
5. Campbell, J. R., Voelkl, K. E. & Donahue, P. L. (1997). NAEP 1996 trends in academic progress (national report ). Washington, DC: National Center For Educational Statistics.