@article{824380,
      author = {Kanbir, Sinan, and Clements, M. A. and Ellerton, Nerida F.  and Kelly, Anthony E.,},
      url = {http://library.usi.edu/record/824380},
      title = {Using design research and history to tackle a fundamental  problem with school algebra : improving the quality of  algebra education at the middle-school level /},
      recid = {824380},
      pages = {1 online resource.},
}