@incollection {370857, title = {Learning concepts through the history of mathematics: the case of symbolic algebra.}, booktitle = {Philosophical dimensions in mathematics education}, year = {2007}, pages = {83{\textendash}103}, publisher = {Springer}, isbn = {978-0-387-71571-1}, author = {Heeffer, Albrecht}, editor = {Fran{\c c}ois, Karen and Van Bendegem, Jean Paul} }