@TechReport{Matz99,
   author=      "Oliver Matz",
   title=       "Dot-{D}epth and {M}onadic {Q}uantifier {A}lternation over {P}ictures",
   institution= "RWTH Aachen",
   year=        "1999",
   number=      "AIB-08-1999",
   url=         "http://aib.informatik.rwth-aachen.de/1999/1999-08.ps.gz",
}