@article{296789,
      recid = {296789},
      author = {Cheng, Ta-Pei.},
      title = {Relativity, gravitation, and cosmology : a basic  introduction /},
      publisher = {Oxford University Press,},
      address = {Oxford ;},
      pages = {xiii, 339 p. :},
      year = {2005},
      url = {http://library.usi.edu/record/296789},
}