1. On the number of positive integers ≤x all of whose prime factors are ≤y;Briggs,1955
2. On those numbers in an arithmetic progression all prime factors of which are small in order of magnitude;Buchstab;Dokl. Akad. Nauk. SSR (N.S),1949
3. The asymptotic behavior of the Dickman-De Bruijn function;Canfield,1982
4. On a problem of Oppenheim concerning “Factorisatio Numerorum”;Canfield;J. Number Theory,1983
5. I. On the number of positive integers ≤x and free of prime factors >y;De Bruijn,1951