@article{SM_2013_204_4_a5,
     author = {K. L. Kozlov},
     title = {Topology of actions and homogeneous spaces},
     journal = {Sbornik. Mathematics},
     pages = {588--620},
     year = {2013},
     volume = {204},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2013_204_4_a5/}
}