MUTHURAMALINGAM, P. Spectral properties of vaguely elliptic pseudo differential operators with momentum dependent long range potentials using time dependent scattering theory - II. MATHEMATICA SCANDINAVICA, [S. l.], v. 58, p. 255–274, 1986. DOI: 10.7146/math.scand.a-12145. Disponível em: https://www.mscand.dk/article/view/12145. Acesso em: 23 jul. 2024.