@article{NSJOM_1983_13_Nonea_29,
     author = {Acketa Dragan M.},
     title = {The inverse of a 

 {Tr-lattice} need not be a {Tr-lattice}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {317-338},
     publisher = {mathdoc},
     volume = {13},
     year = {1983},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1983_13_Nonea_29/}
}