1. J. R. Blum and M. Rosenblatt, On the structure of the infinitely divisible distributions. Pacific J. Math.
9 (1959), 1–7.
2. K. L. Chung, Sur les lois de probabilités unimodales. C. R. Acad. Sci. Paris
236 (1953), 583–584.
3. M. Fisz, On the continuity of the L-distribution functions. Zeit. Wahr.
1 (1962), 25–27.
4. M. Fisz and V. S. Varadarajan, A condition for absolute continuity of infinitely divisible distribution functions. Zeit. Wahr.
1 (1963), 335–339.
5. B. V. Gnedenko and A. N. Kolmogorov, Limit Distribution Functions for Sums of Independent Random Variables. Addison-Wesley, Reading, MA, 1954 (translated by K. L. Chung).