@article{DAN_1991_319_1_a15,
     author = {Pham Huu Tiep},
     title = {A reduction theorem for invariant lattices of type $A_n$},
     journal = {Doklady Akademii Nauk},
     pages = {78--82},
     publisher = {mathdoc},
     volume = {319},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_1_a15/}
}