1. The part metric in convex sets;Bauer, Heinz;Pacific J. Math.,1969
2. Barycenters of measures on certain noncompact convex sets;Bourgin, Richard D.;Trans. Amer. Math. Soc.,1971
3. G. Choquet, Lectures on analysis. Vols. I, II, III, Benjamin, New York, 1969. MR 40 #3252; #3253; #3254.
4. Pure and Applied Mathematics, Vol. 7;Dunford, Nelson,1958