@TechReport{      Rackoff:1973:ECP:889739,
  Author        = "Rackoff, C.",
  Address       = "Cambridge, MA, USA",
  date-added    = "2014-08-21 13:07:23 +0000",
  date-modified = "2014-10-14 08:08:10 +0000",
  Publisher     = "Massachusetts Institute of Technology",
  source        = "http://www.ncstrl.org:8900/ncstrl/servlet/search?formname=detail\&id=oai\%3Ancstrlh\%3Amitai\%3AMIT-LCS\%2F\%2FMIT\%2FLCS\%2FTR-106",
  Title         = "The emptiness and complementation problems for automata on infinite trees",
  Year          = "1973",
  File          = "The emptiness and complementation problems for automata on infinite trees - Rackoff (0) (0) - a - a - d.pdf",
  file-2        = "The emptiness and complementation problems for automata on infinite trees - Rackoff (0) (0) - a - a - d.html"
}

@TechReport{ Rackoff:1973:ECP:889739, Author = "Rackoff, C.", Address = "Cambridge, MA, USA", date-added = "2014-08-21 13:07:23 +0000", date-modified = "2014-10-14 08:08:10 +0000", Publisher = "Massachusetts Institute of Technology", source = "http://www.ncstrl.org:8900/ncstrl/servlet/search?formname=detail\&id=oai\%3Ancstrlh\%3Amitai\%3AMIT-LCS\%2F\%2FMIT\%2FLCS\%2FTR-106", Title = "The emptiness and complementation problems for automata on infinite trees", Year = "1973", File = "The emptiness and complementation problems for automata on infinite trees - Rackoff (0) (0) - a - a - d.pdf", file-2 = "The emptiness and complementation problems for automata on infinite trees - Rackoff (0) (0) - a - a - d.html" }