THAULE, Marius. On Open and Closed Strings. Mathematica Scandinavica, Berkeley, CA, United States, v. 119, n. 2, p. 223–236, 2016. DOI: 10.7146/math.scand.a-24744. Disponível em: https://journals.msp.org/mscand/article/view/341. Acesso em: 24 jul. 2026.