@article{VMUMM_2008_4_a9,
     author = {I. N. Vashchenko},
     title = {A problem of least-squares type},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {51--53},
     publisher = {mathdoc},
     number = {4},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2008_4_a9/}
}