@article{DAN_1957_114_4_a9,
     author = {I. R. Shafarevich},
     title = {Exponents of elliptic curves},
     journal = {Doklady Akademii Nauk},
     pages = {714--716},
     publisher = {mathdoc},
     volume = {114},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_4_a9/}
}