Learning and teaching with understanding. Hiebert, J. & Carpenter, T. P. In pages 65–97. 1992.
bibtex   
@incollection{hiebert_learning_1992,
	title = {Learning and teaching with understanding},
	language = {en},
	author = {Hiebert, James and Carpenter, Thomas P.},
	year = {1992},
	pages = {65--97},
}

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