Hardy spaces on affine symmetric spaces. J. Hilgert; G. Olafsson; B. Orsted — 1991 Journal für die reine und angewandte Mathematik
Leading terms in the heat invariants for the Laplacians of the De Rham signature, and spin complexes. P.B. Gilkey; T.P. Branson; B. Orsted — 1990 Mathematica Scandinavica