About CLEAR Calculus
Sealey, V. & Oehrtman, M. (2005). Student understanding of accumulation and Riemann sums, In G. M. Lloyd, M. R. Wilson, J. L. M. Wilkins, & S. L. Behm (Eds.), Proceedings of the 27th Annual Meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education [CD-ROM]. Eugene, OR: All Academic.