1. D. Broadhurst, Dickman polylogarithms and their constants, preprint, arXiv:1004.0519v1 .
2. A. A. Buchstab, On those numbers in arithmetic progression all of whose prime factors are small in order of magnitude (Russian), Dokl. Akad. Nauk. SSSR, 67 (1949), 5–8.
3. S. Chowla and T. Vijayaraghavan, On the largest prime divisors of numbers, J. Indian Math. Soc. (N.S.), 11 (1947), 31–37.
4. N. G. de Bruijn, On the number of positive integers $$\le x$$ ≤ x and free of prime factors $$> y$$ > y , Indag. Math., 13 (1951), 50–60.
5. K. Dickman, On the frequency of numbers containing prime factors of a certain magnitude, Arkiv. Mat. Astron. Fys., 22 (1930), 1–14.