BRANSON, T. P.; GILKEY, P. B.; ORSTED, B. Leading terms in the heat invariants for the Laplacians of the De Rham signature, and spin complexes. Mathematica Scandinavica, Berkeley, CA, United States, v. 66, p. 307–319, 1990. DOI: 10.7146/math.scand.a-12314. Disponível em: https://journals.msp.org/mscand/article/view/1309. Acesso em: 25 jul. 2026.