@article{DAN_1963_150_5_a5,
     author = {M. D. Kalashnikov and G. P. Gubanov},
     title = {Polynomials of best (quadratic) approximation at a given system of points},
     journal = {Doklady Akademii Nauk},
     pages = {978--980},
     publisher = {mathdoc},
     volume = {150},
     number = {5},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_5_a5/}
}