@article{123522,
      note = {"Spring, 1987."},
      author = {Duncan, David R. and Litwiller, Bonnie H.},
      url = {http://library.usi.edu/record/123522},
      title = {Problem solving with number patterns /},
      publisher = {School Science and Mathematics Association,},
      recid = {123522},
      pages = {vi, 158 p. ;},
      address = {Bowling Green, Ohio :},
      year = {1987},
}