1. Agmon, S. and Nirenberg, L.: Properties of solutions of ordinary differential equations in Banach space. Comm. Pure Appl. Math.16 (1963), 2, 121–239
2. Agmon, S., Douglis, A. and 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; II. Comm. Pure Appl. Math.17 (1964), 35–92
3. Agranovič, M.S. (М.С. Агранович): Elliptic singular integro-differential operators (Russian). Uspehi Mat. Nauk20 (1965). No. 5 (125), 3–120
4. Agranovič, M.S., Dynin, A.S. (М.С. Агранович А.С. Дннин): General boundary value problems for elliptic systems in higher dimensional domains (Russian). Dokl. Akad. Nauk SSSR146 (1962), 511–514
5. Agranovič, M.S. and Višik, M.I. (М.С. Агранович, М.И. Вшшик) Elliptic problems with a parameter and parabolic problems of general type (Russian). Uspehi Mat. Nauk19 (1964), No. 3 (117). 53–161