@article{VMUMM_1989_2_a15,
     author = {A. D. Chanyshev},
     title = {Sandwiches in {Lie} algebras},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {57--59},
     year = {1989},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_2_a15/}
}