@MISC{XBOOLE_1.MIZ,
  AUTHOR = {Committee, Library},
  TITLE = {Boolean Properties of Sets --- Theorems},
  SECTION1 = {Main Part},
  SECTION2 = {Appendix},
  SECTION3 = {Appendix 2},
  DAY = {08},
  MONTH = {April},
  YEAR = {2002},
  ADDRESS1 = {Association of Mizar Users}}

