@article{427224,
      author = {Ungar, Abraham Albert.},
      url = {http://library.usi.edu/record/427224},
      title = {Barycentric calculus in Euclidian and hyperbolic geometry  a comparative introduction / [electronic resource] :},
      publisher = {World Scientific,},
      recid = {427224},
      pages = {xiv, 344 p. :},
      address = {Hackensack, N.J. :},
      year = {2010},
}