%0 Journal Article %A A. B. Aleksandrov %T Approximation by M.~Riesz's kernels in $L^p$ for $p<1$ %J Zapiski Nauchnykh Seminarov POMI %D 2004 %P 5-38 %V 315 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2004_315_a0/ %G ru %F ZNSL_2004_315_a0