1. The asymptotic behaviour of a function occurring in the theory of primes;Bruijn;J. Indian Math. Soc.,1951
2. On the number of positive integers≤x and free of prime factors>y;Bruijn;Kon. Nederl. Akad. Wetensch. Proceedings,1951
3. On the frequency of numbers containing prime factors of a certain relative magnitude;Dickman;Ark. Mat. Astr. Fys,1930
4. The difference between consecutive prime numbers;Rankin;J. London Math. Soc.,1938