WANG, C.Y. Ritz solution of the Helmholtz equation in a stadium-shaped domain with zero normal derivatives – applications to fluid sloshing and thermo-convective stability. Archives of Mechanics, Warsaw, Poland, v. 69, n. 6, p. 471–483, 2017. DOI: 10.24423/aom.2703. Disponível em: http://am.ippt.gov.pl/index.php/am/article/view/v69p471. Acesso em: 17 jan. 2026.