@article{DAN_1960_134_1_a11,
     author = {A. I. Sirota},
     title = {Centers of non-compact simple {Lie} groups},
     journal = {Doklady Akademii Nauk},
     pages = {44--47},
     year = {1960},
     volume = {134},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_1_a11/}
}