%0 Journal Article %A Roman Urban %T Noncoercive differential operators on homogeneous manifolds of negative curvature and their Green functions %J Colloquium Mathematicum %D 2001 %P 121-134 %V 88 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm88-1-9/ %R 10.4064/cm88-1-9 %G en %F 10_4064_cm88_1_9