  The polarization of a surrounding QCD medium modifies the induced gluon
radiation spectrum of a high-energy parton at small transverse momenta for a
single interaction and for multiple scatterings as well. This effect is an
analogue of the Ter-Mikaelian effect in QED, superimposed to the
Landau--Pomeranchuk effect, however it appears in QCD in a different phase
space region.
