@article{,
      recid = {228207},
      author = {Mitchell, Julia H.},
      title = {Estimation skills, mathematics-in-context, and advanced  skills in mathematics : results from three studies of the  National Assessment of Educational Progress 1996  mathematics assessment /},
      publisher = {National Center for Education Statistics, U.S. Dept. of  Education, Office of Educational Research and Improvement  :},
      address = {Washington, DC :},
      number = {NCES 2000-451},
      pages = {1 vol. (various pagings) :},
      year = {1999},
      note = {Shipping list no.: 2000-0091-P.},
      url = {http://library.usi.edu/record/228207},
}