MUTHURAMALINGAM, Pl. 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://tidsskrift.dk/math/article/view/12145. Acesso em: 13 aug. 2026.