Coherent $\rho$ Production from Polarized Deuterium
  We discuss the coherent leptoproduction of vector mesons from polarized deuterium as a tool to investigate the evolution of small size quark-gluon configurations. Kinematic regions are determined where the final state interaction of the initially produced quark-gluon wave packet contributes dominantly to the production cross section. Two methods for an investigation of color coherence effects, which are appropriate for future experiments at HERMES, are suggested. 
L. Frankfurt, W. Koepf, J. Mutzbauer, G. Piller, M. Sargsyan, M.   Strikman