@MISC{SUBSTLAT.MIZ,
  AUTHOR = {Grabowski, Adam},
  TITLE = {Lattice of Substitutions},
  SECTION1 = {Preliminaries},
  SECTION2 = {Definition of the lattice},
  DAY = {21},
  MONTH = {May},
  YEAR = {1997},
  ADDRESS1 = {Warsaw University\\Bia{\l}ystok}}

