BRENNER, Philip. On $L_p$-decay and scattering for nonlinear Klein-Gordon equations. Mathematica Scandinavica, Berkeley, CA, United States, v. 51, p. 333–360, 1982. DOI: 10.7146/math.scand.a-11985. Disponível em: https://journals.msp.org/mscand/article/view/1667. Acesso em: 25 jul. 2026.