@article{781972,
      author = {Soifer, Alexander.},
      url = {http://library.usi.edu/record/781972},
      title = {The Colorado Mathematical Olympiad : the third decade and  further explorations : from the mountains of Colorado to  the peaks of mathematics /},
      publisher = {Springer,},
      doi = {https://doi.org/10.1007/978-3-319-52861-8},
      recid = {781972},
      pages = {1 online resource.},
      address = {Cham :},
      year = {2017},
}