An Hessels

Students' overreliance on proportionality: evidence from primary school students solving elementary arithmetic problems

Lieven Verschaffel, Dirk De Bock, Wim Van Dooren, 2004 .

Remedying secondary school students' illusion of linearity: A teaching experiment

Lieven Verschaffel, Dirk De Bock, Wim Van Dooren, 2004 .