@Book{Misner73,
  author =	 {C. Misner and K. Thorne and J. Wheeler},
  title = 	 {Gravitation},
  publisher = 	 {W. Freeman \& Co},
  year = 	 1973
}

@Book{Tipler94,
  author =	 {F.J. Tipler},
  title = 	 {The Physics of Immortality},
  publisher = 	 {Macmillan},
  year = 	 1994,
  address =	 {London}
}

@Article{Bekenstein81,
  author = 	 {J.D. Bekenstein},
  title = 	 {},
  journal = 	 {Phys Rev D 23},
  year = 	 1981,
  volume =	 287
}