On Positive and Continuous Extension of Positive Functionals Defined over Dense Subspaces. Otte Hustad — 1959 Mathematica Scandinavica
Linear Inequalities and Positive Extension of Linear Functionals. Otte Hustad — 1960 Mathematica Scandinavica
Convex Cones with Properties Related to Weak Local Compactness. Otte Hustad — 1962 Mathematica Scandinavica
Upper Semi-Continuity of Convex Functions and Openness of Affine Maps. Otte Hustad — 1992 Mathematica Scandinavica