Hua 2009,第176-177頁. Hua, L.K., Additive Theory of Prime Numbers, Translations of Mathematical Monographs 13, Providence, RI: American Mathematical Society: 176–177, 2009 [1965], ISBN 978-0821849422, MR 0194404, OCLC 824812353
Ramaré, O., On šnirel'man's constant, Annali della Scuola Normale Superiore di Pisa. Classe di Scienze. Serie IV, 1995, 22 (4): 645–706 [2008-08-22], (原始内容存档于2020-09-19).
Ramaré, O., On šnirel'man's constant, Annali della Scuola Normale Superiore di Pisa. Classe di Scienze. Serie IV, 1995, 22 (4): 645–706 [2008-08-22], (原始内容存档于2020-09-19).
Derbyshire, John, The Prime Number Theorem, Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics, Washington, D.C.: Joseph Henry Press: 33, 2003, ISBN 978-0-309-08549-6, OCLC 249210614使用|accessdate=需要含有|url= (帮助)
Hua 2009,第176-177頁. Hua, L.K., Additive Theory of Prime Numbers, Translations of Mathematical Monographs 13, Providence, RI: American Mathematical Society: 176–177, 2009 [1965], ISBN 978-0821849422, MR 0194404, OCLC 824812353