@MISC{MARGREL1.MIZ,
  AUTHOR = {Woronowicz, Edmund},
  TITLE = {Many-Argument Relations},
  DAY = {01},
  MONTH = {June},
  YEAR = {1990},
  ADDRESS1 = {Warsaw University\\Bia{\l}ystok },
  SUMMARY = {Definitions of relations based on finite sequences.
The arity of relation, the set of logical values {\it Boolean} consisting of 
 {\it false} and {\it true} and the operations of negation and conjunction 
on them are defined.  }}

