The transition from arithmetic to algebra: to reason, explain, argue, generalize and justify. Breiteig, T. & Grevholm, B. In pages 225–232, 2006.
bibtex   
@inproceedings{breiteig2006,
	title = {The transition from arithmetic to algebra: to reason, explain, argue, generalize and justify},
	author = {Breiteig, T. and Grevholm, B.},
	year = {2006},
	pages = {225--232},
}

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