H. Hartwig

A polyconvexity condition in dimension two

H. Hartwig, 1995, Proceedings of the Royal Society of Edinburgh: Section A Mathematics.

Quasiconvexity and related properties in the calculus of variations

H. Hartwig, 1994 .

Local boundedness and continuity of generalized convex functions

H. Hartwig, 1992 .

On generalized convex functions

Helga Hartwig, H. Hartwig, 1983 .

A Note on roughly convex functions

H. Hartwig, 1996 .

Generalized convexities of lower semicontinuous functions

Helga Hartwig, H. Hartwig, 1985 .