  We discuss applications of the color dipole approach to hard processes on
nuclei. We focus on the relation to k_t--factorisation and the role of a
nuclear unintegrated gluon distribution in single-- and two-- particle
inclusive spectra in \gamma^*A and pA collisions. Linear k_t factorisation is
broken for a wide class of observables, which we exemplify on the case of heavy
quark p_t--spectra.
