Geodesic
The inverse of a Tr-lattice need not be a Tr-lattice
Novi Sad Journal of Mathematics, Tome 13 (1983).

Voir la notice de l'article provenant de la source Novi sad journal of mathematics website

@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/}
}
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 Tr-lattice need not be a Tr-lattice
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 Tr-lattice need not be a Tr-lattice
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Acketa Dragan M. The inverse of a 

 Tr-lattice need not be a Tr-lattice. Novi Sad Journal of Mathematics, Tome 13 (1983). http://geodesic.mathdoc.fr/item/NSJOM_1983_13_Nonea_29/