@article{DAN_1967_177_4_a3,
     author = {I. M. Gel'fand and D. B. Fuchs},
     title = {Topological invariants of noncompact {Lie} groups connected with infinite dimensional representations},
     journal = {Doklady Akademii Nauk},
     pages = {763--766},
     publisher = {mathdoc},
     volume = {177},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_4_a3/}
}