@article{IM2_2001_65_3_a4,
     author = {V. A. Kolyvagin},
     title = {Fermat's equation over the tower of cyclotomic fields},
     journal = {Izvestiya. Mathematics },
     pages = {503--541},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2001_65_3_a4/}
}