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, [S. l.], v. 66, p. 307–319, 1990. DOI: 10.7146/math.scand.a-12314. Disponível em: https://tidsskrift.dk/math/article/view/12314. Acesso em: 13 aug. 2026.