Elliptic operator in the sense of ADN

3. Zbl 0922.35042 Agmon, Shmuel
Representation theorem for solutions of the Helmholtz equation on $\bbfR^n$. (English)
Buslaev, V. (ed.) et al., Differential operators and spectral theory. M. Sh. Birman's 70th anniversary collection. Providence, RI: American Mathematical Society. Transl., Ser. 2, Am. Math. Soc. 189(41), 27-43 (1999). MSC 2000: *35J05 35C15, Reviewer: P.K.Mahanti

MR0162050 (28 #5252) Agmon, S.; Douglis, A.; Nirenberg, L. Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. II. Comm. Pure Appl. Math. 17 1964 35--92. (Reviewer: G. Geymonat) 35.46

MR0125307 (23 #A2610)
Agmon, S.; Douglis, A.; Nirenberg, L.
Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. I.
Comm. Pure Appl. Math. 12 1959 623--727.
35.43