%0 Journal Article %A Dzik, Wojciech %A Wróbel, Beniamin %T Unifiability and Structural Completeness in Relation Algebras and in Products of Modal Logic S5 %J Bulletin of the Section of Logic %D 2015 %V 44 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/BSL_2015_44_1-2_a7/ %F BSL_2015_44_1-2_a7