VÄÄNÄNEN, K. On the approximation of certain infinite products. MATHEMATICA SCANDINAVICA, [S. l.], v. 73, p. 197–208, 1993. DOI: 10.7146/math.scand.a-12465. Disponível em: https://tidsskrift.dk/math/article/view/12465. Acesso em: 14 aug. 2026.