“…The functions # = <P k (y 1 + iy 2 , e, 0), k = 1,3, and $ = <P k (y 1 -i y 2 , e, 9), k = 2, 4, are the partial Fourier transforms with respect to the variable s of arbitrary four functions x ¥ k : (C 2 -»(C, holomorphic for k odd: *P k = 'F k (y 1 + iy 2 , e + iß), k = l,3, and antiholomorphic for k even: <F k = *F k (y 1 -iy 2 , e-i9), k = 2,0. The transformation is determined by substituting the expressions (15) into (13) and, similarly, 7 2 by substituting the expressions (16) into (14).…”