Convexity of measures in certain convex cones in vector space ...-algebras. Christer Borell (1983) Mathematica Scandinavica
Convexity preserving summability matrices. Selvaraj, C.R. (1990) International Journal of Mathematics and Mathematical Sciences
Correction to the paper: Sets invariant under projections onto one dimensional subspaces Simon Fitzpatrick, Bruce Calvert (1992) Commentationes Mathematicae Universitatis Carolinae