@article{IM2_1973_7_4_a1,
     author = {O. N. Vvedenskii},
     title = {On ``universal norms'' of formal groups defined over the ring of integers of a~local field},
     journal = {Izvestiya. Mathematics },
     pages = {733--747},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_4_a1/}
}