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{||(F*G)|_H||}_{L^{r}(H)} \\leq {||F||}_{\\Lambda^H_{2, p}({\\Bbb R}^{n})} \\cdot {||G||}_{\\Lambda^H_{2, q}({\\Bbb R}^{n})},$$ where the mixed norms on the right are defined by\n  $$ {||F||}_{\\Lambda^H_{2,p}({\\Bbb R}^{n})}={(\\int_{H^*} {(\\int {|\\hat{F}|}^2 dH_{\\xi}^{\\perp})}^{\\frac{p}{2}} d\\xi)}^{\\frac{1}{p}},$$ with $dH_{\\xi}^{\\perp}$ the $(n-k)$-dimensional Lebesgue measure on 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