1. Butzer, P. L., W. Dickmeis, L. Hahn, and R. J. Nessel,Lax-type theorems and a unified approach to some limit theorems in probability theory with rates, preprint.
2. Goldstein, J. A.,Semigroup theoretic proofs of the central limit theorem and other theorems of analysis, Semigroup Forum 12 (1976), 189–206, 388.
3. Krickeberg, K., Probability Theory, Addison-Wesley, Reading, Mass., 1965.