Estermann, T. (1938). "On Goldbach's problem: proof that almost all even positive integers are sums of two primes". Proceedings of the London Mathematical Society. 2. 44: 307–314. doi:10.1112/plms/s2-44.4.307.
Van der Corput, J. G. (1938). "Sur l'hypothèse de Goldbach"(PDF). Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen Amsterdam (in French). 41: 76–80. Archived(PDF) from the original on 2013-10-20. Retrieved 2013-07-30.
"Letter XLIII, Goldbach to Euler". Correspondence of Leonhard Euler. Mathematical Association of America. 7 June 1742. Archived from the original on 2025-01-20. Retrieved 2025-01-19.
"Letter XLIV, Euler to Goldbach"(PDF). Correspondence of Leonhard Euler. Mathematical Association of America. 30 June 1742. Archived(PDF) from the original on 2024-09-17. Retrieved 2025-01-19.
Schnirelmann, L. G. (1930). 'On the additive properties of numbers". First published in Proceedings of the Don Polytechnic Institute in Novocherkassk (in Russian), vol 14 (1930), pp. 3–27, and reprinted in Uspekhi Matematicheskikh Nauk (in Russian), 1939, no. 6, 9–25.
"Letter XLIII, Goldbach to Euler". Correspondence of Leonhard Euler. Mathematical Association of America. 7 June 1742. Archived from the original on 2025-01-20. Retrieved 2025-01-19.
"Letter XLIV, Euler to Goldbach"(PDF). Correspondence of Leonhard Euler. Mathematical Association of America. 30 June 1742. Archived(PDF) from the original on 2024-09-17. Retrieved 2025-01-19.
Van der Corput, J. G. (1938). "Sur l'hypothèse de Goldbach"(PDF). Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen Amsterdam (in French). 41: 76–80. Archived(PDF) from the original on 2013-10-20. Retrieved 2013-07-30.