  We derive the inclusive transverse spectrum of minijets in nuclear collisions
at very high energies by assuming that the nuclear S-matrix factorizes into a
product of elastic S-matrices for elementary partonic collisions. Interference
effects and, in particular, the contribution of loop diagrams are fully taken
into account in the derivation of the spectrum, which is shown to coincide with
the result earlier obtained by superposing the elementary interactions
incoherently. A quantitative analysis confirms that the deformation induced by
multiple collsions is a large effect at RHIC and LHC energies, for transverse
momenta ~ 20 GeV.
