KÖHLER, Günter. Some eta-identities arising from theta series. Mathematica Scandinavica, Berkeley, CA, United States, v. 66, p. 147–154, 1990. DOI: 10.7146/math.scand.a-12299. Disponível em: https://journals.msp.org/mscand/article/view/1322. Acesso em: 24 jul. 2026.