LIU, Yang. Semiclassical limit of the spectral decomposition of a Schrödinger operator in one dimension. MATHEMATICA SCANDINAVICA, [S. l.], v. 69, p. 291–306, 1991. DOI: 10.7146/math.scand.a-12381. Disponível em: https://tidsskrift.dk/math/article/view/12381. Acesso em: 14 aug. 2026.