@article{UZKU_2011_153_3_a1,
     author = {M. A. Akivis and A. M. Shelekhov},
     title = {Closed $G$-structures defined by three-webs},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {22--28},
     publisher = {mathdoc},
     volume = {153},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2011_153_3_a1/}
}