@article{SEMR_2013_10_a12,
     author = {S. S. Ibraev},
     title = {On the central extensions of classical {Lie} algebras},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {450--453},
     publisher = {mathdoc},
     volume = {10},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2013_10_a12/}
}