@MISC{US20120072656,
  TITLE =        "Multi-Tier Caching",
  AUTHOR =       "Archak, S. and Dixit, S. and Spillane, R.P. and Zadok, E.",
  URL =          "\url{www.google.com/patents/US20120072656}",
  YEAR =         "2012",
  MONTH =        "March",
  PUBLISHER =    "Google Patents",
  NOTE =         "US Patent App. 13/159,039",
}