VÄÄNÄNEN, K. On the approximation of certain infinite products. Mathematica Scandinavica, Berkeley, CA, United States, v. 73, p. 197–208, 1993. DOI: 10.7146/math.scand.a-12465. Disponível em: https://journals.msp.org/mscand/article/view/1201. Acesso em: 24 jul. 2026.