STEGBUCHNER, H. On some extensions of a theorem of Hardy and Littlewood. Annales Fennici Mathematici, [S. l.], v. 7, n. 2, p. 113–117, 1982. DOI: 10.5186/aasfm.1982.0729. Disponível em: https://afm.journal.fi/article/view/134434. Acesso em: 25 nov. 2024.