%0 Journal Article %A Acketa Dragan M. %T The inverse of a Tr-lattice need not be a Tr-lattice %J Novi Sad Journal of Mathematics %D 1983 %P 317-338 %V 13 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_1983_13_Nonea_29/ %F NSJOM_1983_13_Nonea_29