References
S. Agmon, The coerciveness problem for integro-differential forms. J. Analyse Math.6, 183–223 (1958).
S.Agmon, Lectures on elliptic boundary value problems. New York 1965.
L. Gårding, Dirichlet's problem for linear elliptic partial differential equations. Math. Scand.1, 55–72 (1953).
L.Hörmander, The analysis of linear partial differential operators II. Berlin-Heidelberg-New York-Tokyo 1983.
N.Jacob, On Dirichlet's boundary value problem for some formally hypoelliptic differential operators. To appear.
F.Stummel, Rand- und Eigenwertaufgaben in Sobolewschen Räumen. Berlin-Heidelberg-New York 1969.
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Jacob, N. A converse to Gårding's inequality for a class of formally hypoelliptic differential operators. Arch. Math 49, 309–315 (1987). https://doi.org/10.1007/BF01210715
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DOI: https://doi.org/10.1007/BF01210715