%0 Journal Article %A Tord Sjödin %T Weighted norm inequalities for Riesz potentials and fractional maximal functions in mixed norm Lebesgue spaces %J Studia Mathematica %D 1990 %P 239-244 %V 97 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-97-3-239-244/ %R 10.4064/sm-97-3-239-244 %G en %F 10_4064_sm_97_3_239_244