Ely, R. (to appear July 2012). Loss of dimension in the history of calculus and in student reasoning. The Mathematics Enthusiast.
Ely, R. & Adams, A. (2012). Unknown, placeholder, or variable: What is x? Mathematics Education Research Journal, 24, 19–38.
Ely, R. (2011). Envisioning the infinite by projecting finite properties. Journal of Mathematical Behavior, 30(1): 1-18.
Ellis, A. & Ely, R. (2011). The Case of the Mystery Table. Mathematics Teaching in the Middle School.
Ely, R. (2010). Nonstandard student conceptions about infinitesimal and infinite numbers. Journal for Research in Mathematics Education. 41(2): 117–146.
Ely, R. & Cohen, J. S. (2010). Using student work: The double-spin game. Mathematics Teaching in the Middle School, 16(4), 208-215.