On the spectral theory of elliptic differential operators. I

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Koshelev, A. I.: On a-priori estimates inL p of generalized solutions of elliptic equations and systems. Uspekhi Mat. Nauk13, 29?88 (1958).

Kuroda, S. T.: Perturbation of continuous spectrum by unbounded operators. To appear.

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Morrey jr., C. B.: On the analyticity of the solutions of analytic non-linear elliptic systems of partial differential equations. II. Am. J. Math.80, 219?237 (1958).

Morrey jr., C. B., andL. Nirenberg: On the analyticity of solutions of linear elliptic systems of partial differential equations. Communs Pure Appl. Math.10, 271?290 (1957).

Nirenberg, L.: Remarks on strongly elliptic partial differential equations. Communs Pure Appl. Math.8, 649?675 (1955).

Nirenberg, L.: Estimates and existence of solutions of elliptic equations. Communs Pure Appl. Math.9, 509?530 (1956).

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Schechter, M.: On estimating elliptic partial differential operators in theL 2-norm. Am. J. Math.79, 431?443 (1957).

Schechter, M.: Coerciveness of linear partial differential operators for functions satisfying zero Dirichlet-type boundary data. Communs Pure Appl. Math.11, 153?174 (1958).

Schechter, M.: Solution of the Dirichlet problem for equations not necessarily strongly elliptic. Bull. Am. Math. Soc.64, 371?372 (1958).

Schechter, M.: Integral inequalities for partial differential operators and functions satisfying general boundary conditions. Communs Pure Appl. Math.12, 37?66 (1959).

Schechter, M.: General boundary value problems for elliptic partial differential equations. Bull. Am. Math. Soc.65, 70?72 (1959).

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Wienholtz, E.: Halbbeschränkte partielle Differentialoperatoren zweiter Ordnung vom elliptischen Typus. Math. Ann.135, 50?80 (1958).

Wolf, F.: Essential spectrum of partial differential boundary problems. Communs Pure Appl. Math.12, 211?228 (1959).