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  1. ↑ Sándor, József; Dragoslav, Mitrinović S.; Crstici, Borislav (2006). Handbook of Number Theory I. Springer. tr. 316. doi:10.1007/1-4020-3658-2. ISBN 978-1-4020-4215-7.
  2. ↑ Rényi, Alfréd A. (1948). “On the representation of an even number as the sum of a single prime and single almost-prime number”. Izvestiya Rossiiskoi Akademii Nauk. Seriya Matematicheskaya (bằng tiếng Nga). 12 (1): 57–78.
  3. ↑ Heath-Brown, D. R. (tháng 5 năm 1978). “Almost-primes in arithmetic progressions and short intervals”. Mathematical Proceedings of the Cambridge Philosophical Society. 83 (3): 357–375. Bibcode:1978MPCPS..83..357H. doi:10.1017/S0305004100054657.
  4. ↑ Tenenbaum, Gerald (1995). Introduction to Analytic and Probabilistic Number Theory. Cambridge University Press. ISBN 978-0-521-41261-2.
  5. ↑ Landau, Edmund (1953) [first published 1909]. “§ 56, Über Summen der Gestalt ∑ p ≤ x F ( p , x ) {\displaystyle \sum _{p\leq x}F(p,x)} ”. Handbuch der Lehre von der Verteilung der Primzahlen. 1. Chelsea Publishing Company. tr. 211.