@MISC{SYSREL.MIZ,
  AUTHOR = {Korczy\'nski, Waldemar},
  TITLE = {Some Properties of Binary Relations},
  DAY = {17},
  MONTH = {January},
  YEAR = {1992},
  ADDRESS1 = {Pedagogical University\\Kielce},
  SUMMARY = {The article contains some theorems on binary relations, which are used
in papers \cite{FF_SIEC.ABS}, \cite{E_SIEC.ABS}, \cite{S_SIEC.ABS},
and other.}}

