NAZAROV, S. A.; TASKINEN, J. On essential and continuous spectra of the linearized water-wave problem in a finite pond. MATHEMATICA SCANDINAVICA, [S. l.], v. 106, n. 1, p. 141–160, 2010. DOI: 10.7146/math.scand.a-15129. Disponível em: https://www.mscand.dk/article/view/15129. Acesso em: 28 mar. 2024.