@article{RM_1966_21_4_a3,
     author = {M. M. Postnikov},
     title = {On {Cartan's} theorem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {25--36},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1966},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1966_21_4_a3/}
}