@article{93603,
      note = {Companion vol. to: The Development of mathematical  thinking.},
      author = {Lesh, Richard A.},
      url = {http://library.usi.edu/record/93603},
      title = {Acquisition of mathematics concepts and processes /},
      publisher = {Academic Press,},
      recid = {93603},
      pages = {xii, 409 p. :},
      address = {New York :},
      year = {1983},
}