@MISC{CLASSES1.MIZ,
  AUTHOR = {Bancerek, Grzegorz},
  TITLE = {Tarski's Classes and Ranks},
  DAY = {23},
  MONTH = {March},
  YEAR = {1990},
  ADDRESS1 = {Warsaw University\\Bia{\l}ystok},
  SUMMARY = {In the article the Tarski's classes (non-empty families of sets
satisfying Tarski's axiom A given in \cite{TARSKI.ABS}) and the rank sets are
introduced and some of their properties are shown. The transitive
closure and the rank of a set is given here too.}}

