%0 Journal Article %A Drewniak, Józef %A Dudziak, Urszula %T Preservation of properties of fuzzy relations during aggregation processes %J Kybernetika %D 2007 %P 115-132 %V 43 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_2007__43_2_a1/ %G en %F KYB_2007__43_2_a1