An a Priori Estimate for the Oscillation of the Normal to a Hypersurface Whose First and Second Variation With Respect to an Elliptic Integrand is Controlled. W.K. Allard — 1983 Inventiones mathematicae
The Structure of Stationary One Dimensional Varifolds with Positive Density. W.K. Allard; F.J. Jr. Almgren — 1976 Inventiones mathematicae