1. Development of students’ understanding of cosets, normality, and quotient groups;Asiala;Journal of Mathematical Behavior,1997
2. Bartlo, J., Larsen, S., & Lockwood, E. (2008). Scaling up instructional activities: Lessons learned from a collaboration between a mathematician and mathematics education researcher. Conference on research in undergraduate mathematics education. San Diego, CA. Retrieved May 8, 2009 from http://www.rume.org/crume2008/Bartlo_LONG.pdf.
3. Learning binary operations, groups, and subgroups;Brown;Journal of Mathematical Behavior,1997
4. What are the fundamental concepts of group theory?;Burn;Educational Studies in Mathematics,1996
5. A method for conducting longitudinal analyses of classroom videorecordings and transcripts;Cobb;Educational Studies in Mathematics,1996