%0 Journal Article %A R. A. Raitsin %T On the best mean-square approximation, by polynomials and entire functions of exponential type, to functions with a~logarithmic singular point %J Informatics and Automation %D 1987 %P 185-186 %V 180 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a111/ %G ru %F TRSPY_1987_180_a111