@article{IM2_1980_15_2_a4,
     author = {V. A. Kolyvagin},
     title = {Formal groups and the norm residue symbol},
     journal = {Izvestiya. Mathematics },
     pages = {289--348},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1980_15_2_a4/}
}