%0 Journal Article %A Alexey N. Karapetyants %T On $L_p$-$L_q$ boundedness for convolutions with kernels having singularities on a sphere %J Studia Mathematica %D 2001 %P 121-134 %V 144 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm144-2-2/ %R 10.4064/sm144-2-2 %G en %F 10_4064_sm144_2_2