%0 Journal Article %1 hefendehlhebeker1991nno %A Hefendehl-Hebeker, L. %D 1991 %J For the Learning of Mathematics %K history mathematics number obstacles %N 1 %P 26--32 %T Negative numbers: Obstacles in their evolution from intuitive to intellectual constructs %U http://eric.ed.gov/ERICWebPortal/recordDetail?accno=EJ433622 %V 11

@article{hefendehlhebeker1991nno, added-at = {2007-05-08T11:57:57.000+0200}, author = {Hefendehl-Hebeker, L.}, biburl = {https://www.bibsonomy.org/bibtex/22957228ca68c9f473e1c7d5b3a128c15/rmosvold}, interhash = {0f2d69fbfab30c32e45c01e675dd42d3}, intrahash = {2957228ca68c9f473e1c7d5b3a128c15}, journal = {For the Learning of Mathematics}, keywords = {history mathematics number obstacles}, note = {Jeg har en papirkopi av denne artikkelen.}, number = 1, pages = {26--32}, timestamp = {2007-05-08T11:57:57.000+0200}, title = {Negative numbers: Obstacles in their evolution from intuitive to intellectual constructs}, url = {http://eric.ed.gov/ERICWebPortal/recordDetail?accno=EJ433622}, volume = 11, year = 1991 }