@MISC{CLOSURE3.MIZ,
  AUTHOR = {Marasik, Agnieszka Julia},
  TITLE = {Algebraic Operation on Subsets of Many Sorted Sets},
  SECTION1 = {Preliminaries},
  SECTION2 = {Relationships between Subsets Families},
  SECTION3 = {Algebraic Operation on Subsets of Many Sorted Sets},
  DAY = {23},
  MONTH = {June},
  YEAR = {1997},
  ADDRESS1 = {Warsaw University\\Bia{\l}ystok}}

