@article{IVM_2007_8_a4,
     author = {A. V. Ryzhkova and E. I. Yakovlev},
     title = {Principal bundles admitting almost invariant structures},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {48--59},
     publisher = {mathdoc},
     number = {8},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2007_8_a4/}
}