The multiplicative product (δ(x0-|x|)/|x|(n-2/2))(δ(x0+|x|)/|x|(n-2/2))

In this paper we give a sense to the distributional multiplicative product (delta(x(0) - \x\)/\x\((n-2)/2))(delta(x(0) + \x\)/\x\((n-2)/2)). For the case n = 4 we obtain a formula which is used for a perturbative calculation of Green function in quantum field theories. As an application of our product, we show the calculation of the self-energy of the theory of lambda phi(4).