@article{article8870cccf,
title   = {On the essential spectrum of a semigroup of thermoelasticity},
author = {Henry, Daniel Bauman and Perissinitto, Anisio and Lopes, Orlando},
year = {1993},
doi = {10.1016/0362-546X(93)90178-U},
journal   = {Nonlinear Analysis: Theory, Methods & Applications}
}