@article{467692,
      author = {Grego, Peter.},
      url = {http://library.usi.edu/record/467692},
      title = {Venus and Mercury, and how to observe them [electronic  resource] /},
      publisher = {Springer,},
      recid = {467692},
      pages = {xiii, 262 p. :},
      address = {New York :},
      year = {2008},
}