M. Blasco," O.",calabuig," J., Fourier analysis with respect to bilinear maps, Acta mathematica Sinica. English series (Print) , 25(4), 2009, pp. 519-530
Several results about convolution and about Fourier coefficients for X-valued functions defined on the torus satisfying the condition sup.y.=1 . ... . B(f(ei.), y).d./2. < . for a bounded bilinear map B: X . Y . Z are presented and some applications are given.