Branson, T.P., Gilkey, P.B. and Orsted, B. 1990. Leading terms in the heat invariants for the Laplacians of the De Rham signature, and spin complexes. MATHEMATICA SCANDINAVICA. 66, (Jun. 1990), 307–319. DOI:https://doi.org/10.7146/math.scand.a-12314.