KOWITZ, Krzysztof. Twin, cousin, and sexy prime counting function. Explicit formulas. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 8, p. 1260–1264, 2024. DOI: 10.3842/umzh.v76i8.7567. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7567. Acesso em: 5 dec. 2025.