Positive self-adjoint extensions of operators affiliated with a von Neumann algebra. Christian F. Skau — 1979 Mathematica Scandinavica
Simplicial Decomposition of Boundary Measures on Convex Compact Sets. Erik M. Alfsen; Christian F. Skau — 1970 Mathematica Scandinavica
Geometric aspects of the Tomita-Takesaki theory II. Uffe Haagerup; Christian F. Skau — 1981 Mathematica Scandinavica