Existence and Regularity Almost Everywhere of Solutions to Elliptic Variational Problems among Surfaces of Varying Topological Type and Singularity Structure
F. J. Almgren · Annals of Mathematics · 1968
F. J. Almgren, Jr., Existence and Regularity Almost Everywhere of Solutions to Elliptic Variational Problems among Surfaces of Varying Topological Type and Singularity Structure, Annals of Mathematics, Second Series, Vol. 87, No. 2 (Mar., 1968), pp. 321-391