%0 Journal Article %A U. Boscain %A J.-P. Gauthier %A F. Rossi %T Hypoelliptic heat kernel over $3$-step nilpotent Lie groups %J Contemporary Mathematics. Fundamental Directions %D 2011 %P 48-61 %V 42 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMFD_2011_42_a5/ %G ru %F CMFD_2011_42_a5