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2. On the central limit theorem in the space 𝑅_{𝑘},𝑘>1;Bergström, Harald;Skand. Aktuarietidskr.,1945
3. The accuracy of the Gaussian approximation to the sum of independent variates;Berry, Andrew C.;Trans. Amer. Math. Soc.,1941
4. On the lower limit of sums of independent random variables;Chung, Kai-Lai;Ann. of Math. (2),1947
5. H. Cramér, Random variables and probability distributions, Cambridge Tracts in Mathematics, No. 36, Cambridge University Press, 1937.