Aspects of approximation theory for functions of one complex variable

Theory of reproducing kernels

N. Aronszajn · Transactions of the American Mathematical Society · 1950 · 5.4K citations · Full text

On the existence of certain singular integrals

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

Spectral Theory, Engineering, Certain Singular Integrals +4

Local behavior of solutions of quasi-linear equations

James Serrin · Acta Mathematica · 1964 · 1K citations · Full text

Curvature measures

Herbert Fédérer · Transactions of the American Mathematical Society · 1959 · 855 citations

Dimensional Compact, Representation Theory, Matrix Theory +1

Conformal invariants and function-theoretic null-sets

Lars V. Ahlfors, Arne Beurling · Acta Mathematica · 1950 · 409 citations · Full text