@article{IM2_1971_5_3_a7,
     author = {O. V. Manturov},
     title = {On multiplication in a~complex $K$-functor},
     journal = {Izvestiya. Mathematics},
     pages = {641--667},
     year = {1971},
     volume = {5},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_3_a7/}
}