ALEXANDROV, Bogdan. On weak holonomy. Mathematica Scandinavica, Berkeley, CA, United States, v. 96, n. 2, p. 169–189, 2005. DOI: 10.7146/math.scand.a-14951. Disponível em: https://journals.msp.org/mscand/article/view/746. Acesso em: 24 jul. 2026.