1. Buchberger, B. (1989). Why students should learn integration rules? (RISC-Linz Technical Report, No. 89-7.0), University of Linz, Austria.
2. Crocker, D.A. (1991). A qualitative study of interactions, concept development and problem solving in a calculus class immersed in a computer algebra system Mathematica'. Unpublished doctoral dissertation, The Ohio State University.
3. Edwards, T. (2000). Computer symbolic algebra: Catalyst for change in secondary school classrooms. Unpublished manuscript, The Ohio State University.
4. Fey, J.T., Heid, M.K., Good, R., Blume, G.W., Sheets, C. & Zbiek, R.M. (1999). Concepts in algebra: A technological approach. Chicago: Everyday Learning.