@article{378526,
      author = {Sierpinska, Anna.},
      url = {http://library.usi.edu/record/378526},
      title = {Understanding in mathematics [electronic resource] /},
      publisher = {Falmer,},
      recid = {378526},
      pages = {xv, 189 p. :},
      address = {London ;},
      year = {1994},
}