MCINTOSH, A.; NAHMOD, A. Heat kernel estimates and functional calculi of $-b \Delta$. MATHEMATICA SCANDINAVICA, [S. l.], v. 87, n. 2, p. 287–319, 2000. DOI: 10.7146/math.scand.a-14310. Disponível em: https://www.mscand.dk/article/view/14310. Acesso em: 4 may. 2024.