PING WANG, Xue. Semi-classical measures and the Helmholtz Equation. CUBO, A Mathematical Journal, [S. l.], v. 7, n. 1, p. 71–97, 2005. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1620. Acesso em: 4 nov. 2025.