Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. I

On the existence of certain singular integrals

A. P. Calderón, A. Zygmund · Acta Mathematica · 1952 · 1K citations · Full text

Natural Sciences, Physics, Impracticability +7

On Singular Integrals

A. P. Calderón, A. Zygmund · American Journal of Mathematics · 1956 · 427 citations

Interior estimates for elliptic systems of partial differential equations

Avron Douglis, Louis Nirenberg · Communications on Pure and Applied Mathematics · 1955 · 406 citations

Computing, Computational Engineering, Finite Element Methods +12

Remarks on strongly elliptic partial differential equations

Louis Nirenberg · Communications on Pure and Applied Mathematics · 1955 · 399 citations

Natural Sciences, Mathematics, Differential Equations +10

Plane waves and spherical means applied to partial differential equations

Gian‐Carlo Rota · Advances in Mathematics · 1983 · 380 citations

Natural Sciences, Earth Sciences, Differential Equations +12