Low-frequency propagation of plane scalar waves through a periodic array of arbitrary volumetric obstacles. Neliniini Kolyvannya, [S. l.], v. 6, n. 4, p. 511–524, 2003. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/283. Acesso em: 22 jan. 2026.