Number Worlds: Visual and Experimental Access to Elementary Number Theory Concepts. - Nathalie Sinclair; Rina Zazkis; Peter Liljedahl (Int. J. Comput. Math. Learn., 2003)

Reflections on Reflections. - Peter Liljedahl (Int. J. Comput. Math. Learn., 2004)

A coloured window on pre-service teachers' conceptions of rational numbers. - Nathalie Sinclair; Peter Liljedahl; Rina Zazkis (Int. J. Comput. Math. Learn., 2006)

Bringing Reality into Calculus Classrooms: Mathematizing a Real-life Problem Simulated in a Virtual Environment. - Olga V. Shipulina; David Harris Smith; Peter Liljedahl (Int. J. Eng. Pedagog., 2013)