1. Araujo, A. and Giné, E. (1980).The Central Limit Theorem for Real and Banach Valued Random Variables. Wiley, New York.
2. Bingham, N. H., Goldie, C. M. and Teugels, J. L. (1987).Regular Variation. Cambridge Univ. Press, Cambridge.
3. Crépel, P. and Raugi A. (1978). Théorème central limite sur les groupes nilpotents.Ann. Inst. Henri Poincaré.14, 145–164.
4. Feller, W. (1966a).An Introduction to Probability Theory and its Applications Vol. II. Wiley, New York.
5. Feller, W. (1966b). On regular variation and local limit theorems.Proc. V Berkeley Symp. Math. Stats. Prob. II. Part I pp. 373–388.