MCINTOSH, Alan; NAHMOD, Andrea. Heat kernel estimates and functional calculi of $-b \Delta$. Mathematica Scandinavica, Berkeley, CA, United States, v. 87, n. 2, p. 287–319, 2000. DOI: 10.7146/math.scand.a-14310. Disponível em: https://journals.msp.org/mscand/article/view/895. Acesso em: 24 jul. 2026.