@inbook{662d550069164ad3bdfab0fe9b74a903,
title = "Facts and Algorithms as Products of Students' Own Mathematical Activity",
keywords = "Wiskunde en Informatica (WIIN), Mathematics, Pedagogie en Andragogie/Onderwijskunde (PEAN), Landbouwwetenschappen, Natuurwetenschappen, Wiskunde: algemeen",
author = "{van Galen}, F.H.J. and K.P.E. Gravemeijer",
year = "2003",
language = "Undefined/Unknown",
publisher = "NCTM",
pages = "114--122",
editor = "J. Kilpatrick and W.G. Martin and D. Schifter",
booktitle = "A Research Companion to Principles and Standards for School Mathematics",
}