YAMAMOTO, Kazuhiro. Exponential energy decay of solutions of elastic wave equations with the Dirichlet condition. Mathematica Scandinavica, Berkeley, CA, United States, v. 65, p. 206–220, 1989. DOI: 10.7146/math.scand.a-12279. Disponível em: https://journals.msp.org/mscand/article/view/1367. Acesso em: 24 jul. 2026.