@article{MZM_1989_46_2_a2,
     author = {M. Babayev},
     title = {Best approximation by bilinear forms},
     journal = {Matemati\v{c}eskie zametki},
     pages = {21--33},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_2_a2/}
}