@article{MZM_1998_63_4_a6,
     author = {B. S. Kashin and A. A. Razborov},
     title = {Improved lower bounds on the rigidity of {Hadamard} matrices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {535--540},
     publisher = {mathdoc},
     volume = {63},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_63_4_a6/}
}