@article{IM2_1997_61_3_a8,
     author = {V. A. Yudin},
     title = {Lower bounds for spherical designs},
     journal = {Izvestiya. Mathematics },
     pages = {673--683},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1997_61_3_a8/}
}