@article{ZVMMF_1989_29_10_a2,
     author = {V. A. Daugavet and P. V. Yakovlev},
     title = {Mean-square approximation of a rectangular matrix by matrices of smaller rank},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1466--1479},
     publisher = {mathdoc},
     volume = {29},
     number = {10},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1989_29_10_a2/}
}