1. Compact Convex Sets and Boundary Integrals;Alfsen,1971
2. Konvexität in topologischen Vektorräumen;Bauer,1963
3. On some convergence criteria for linear positive operators;Baskakov;Uspehi Mat. Nauk,1961
4. Theorems of Korovkin type for positive linear operators on Banach lattices;Berens,1973
5. Sequences of contractions of L1-spaces;Berens;J. Functional Analysis,1974