On the distribution of values of sums of random variables / by K.L. Chung and W.H.J. Fuchs -- Probability limit theorems assuming only the first moment I / by K.L. Chung and P. Erdös -- Remarks on fluctuations of sums of independent random variables / by K.L. Chung and M. Kac -- An invariance principle for certain probability limit theorems / by Monroe D. Donsker