Means and Concave Products of Positive Semi-Definite Matrices. Frank Hansen — 1983 Mathematische Annalen
Perturbations of centre-fixing dynamical systems. Frank Hansen; Dorte Olesen — 1977 Mathematica Scandinavica
Jensen's Inequality for Operators and Löwner 's Theorem. Frank Hansen; Gerd Kjaergard Pedersen — 1981 Mathematische Annalen
Jensen's inequality for conditional expectations. Hansen, Frank — 2005 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Lower bounds on products of correlation coefficients. Hansen, Frank — 2004 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Differential analysis of matrix convex functions. II. Hansen, Frank; Tomiyama, Jun — 2009 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]