Barnet M. Weinstock, Continuous Boundary Values of Analytic Functions of Several Complex Variables, Proceedings of the American Mathematical Society, Vol. 21, No. 2 (May, 1969), pp. 463-466 ...

The operator convex functions of several variables are characterized in terms of a non-commutative generalization of Jensen's inequality, extending previous results of F. Hansen and G.K. Pedersen for ...