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2. On the number of positive integres ⩽x and free of prime factors ⩾y;de Bruijn;Indag. Math.,1951
3. On the difference of consecutive primes;Erdös;Quart. J. Oxford,1935
4. Problems and results on the difference of consecutive primes;Erdös;Publ. Math. Debrecen,1949
5. A large sieve density estimate near σ = 1;Gallagher;Invent. Math.,1970