@article{IM2_1999_63_5_a4,
     author = {V. A. Kolyvagin},
     title = {On the first case of {Fermat's} theorem for cyclotomic fields},
     journal = {Izvestiya. Mathematics },
     pages = {983--994},
     publisher = {mathdoc},
     volume = {63},
     number = {5},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1999_63_5_a4/}
}