Yaping, Jiang et Xuebo, Luo, Explicit Fundamental Solutions for a Class of Left Invariant Operators on the Nilpotent Lie Group G d1+d2, Acta Mathematica Sinica, New Series Chinese Journal of Mathematics, 9(2), 1993, pp. 184-194
In this paper, we give an explicit expression of the fundamental solutions and the global solvability for a class of LPDO's consisting of left invariant vector fields on the nilpotent Lie group G d1+d2