%0 Journal Article %A T. Godoy %A L. Saal %T On the relative fundamental solutions for a second order differential operator on the Heisenberg group %J Studia Mathematica %D 2001 %P 143-164 %V 145 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm145-2-4/ %R 10.4064/sm145-2-4 %G en %F 10_4064_sm145_2_4