Dk. Watson et Rl. Wheeden, Norm estimates and representations for Calderon-Zygmund operators using averages over starlike sets, T AM MATH S, 351(10), 1999, pp. 4127-4171
We show that homogeneous singular integrals may be represented in terms of
averages over starlike sets. This permits us to use the geometry of starlik
e sets to derive operator-specific weighted norm inequalities.