  In this paper, I present a technique to simplify the tensorial reduction of
one-loop integrals with arbitrary internal masses, but at least two massless
external legs. By applying the method to rank l tensor integrals, one ends up
with at most rank 1 tensor functions with the initial number of denominators,
plus tensor integrals with less denominators and rank < l. To illustrate the
algorithm, I explicitly compute diagrams contributing to processes of physical
interest and show how the usual numerical instabilities due to the appearance
of Gram determinants can be controlled.
