WINTNER, Aurel. On an absolute constant pertaining to Cauchy’s "principal moduli" in bounded power series. MATHEMATICA SCANDINAVICA, [S. l.], v. 4, p. 108–112, 1956. DOI: 10.7146/math.scand.a-10459. Disponível em: https://tidsskrift.dk/math/article/view/10459. Acesso em: 14 aug. 2026.