1. The asymptotic behavior of a function occurring in the theory of primes;de Bruijn;J. Indian Math. Soc. (N. S.),1951
2. On the number of positive integers ≦ x and free of prime factors > y;de Bruijn,1951
3. On the number of positive integers ≦ x and free of prime factors > y II;de Bruijn,1966
4. On a problem of Oppenheim concerning “Factorisatio Numerorum”;Canfield;J. Number Theory,1983
5. Sur les fonctions arithmétiques multiplicatives;Delange;Ann. Sci. Ecole Norm. Sup.,1961