@article{1457135,
      author = {Fre, Pietro Giuseppe.},
      url = {http://library.usi.edu/record/1457135},
      title = {Gravity, a geometrical course., Volume 2,: Black holes,  cosmology and introduction to supergravity /},
      publisher = {Springer Science,},
      recid = {1457135},
      pages = {1 online resource (xx, 452 pages ) :},
      address = {Dordrecht :},
      year = {2012},
}