@article{DAN_1974_217_2_a7,
     author = {E. A. Nosilovskii},
     title = {On the canonical form of representations of nilpotent {Lie} groups in a space with indefinite metric},
     journal = {Doklady Akademii Nauk},
     pages = {283--284},
     publisher = {mathdoc},
     volume = {217},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_217_2_a7/}
}