Asymptotics for some green kernels on the Heisenberg group and the Martin boundary

Hypoelliptic second order differential equations

Lars Hörmander · Acta Mathematica · 1967 · 2.4K citations · Full text

Natural Sciences, Mathematics, Differential Equations +5

Introduction to Potential Theory.

P. S. Bullen, L. L. Helms · American Mathematical Monthly · 1971 · 649 citations

Natural Sciences, Mathematics, Physics +12

The distribution of energy in the Brownian motion in the Gaussian field and analytic-hypoellipticity of certain subelliptic operators on the Heisenberg group

Andrzej Hulanicki · Studia Mathematica · 1976 · 196 citations · Full text

Natural Sciences, Mathematics, Physics +11

Hypoellipticity on the Heisenberg group-representation-theoretic criteria

Charles Rockland · Transactions of the American Mathematical Society · 1978 · 105 citations · Full text

Natural Sciences, Mathematics, Physics +17