@article{IVM_1997_11_a3,
     author = {Yu. B. Ermolaev},
     title = {Universal {Cartan} extension},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {22--32},
     publisher = {mathdoc},
     number = {11},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_11_a3/}
}