%0 Journal Article %A Alessandra Cutrì %A Nicoletta Tchou %T Fully nonlinear degenerate operators associated with the Heisenberg group: barrier functions and qualitative properties %J Comptes Rendus. Mathématique %D 2007 %P 559-563 %V 344 %N 9 %I Elsevier %R 10.1016/j.crma.2007.03.003 %G en %F CRMATH_2007__344_9_559_0