@article{nunes_2020,  title={On the Exact Boundary Control for the Linear Klein-Gordon Equation in Non-cylindrical Domains},  volume={21},  ISSN={2179-8451},  url={https://doi.org/10.5540/tema.2020.021.02.0003710371},  DOI={10.5540/tema.2020.021.02.0003710371},  number={2},  journal={TEMA (São Carlos)},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={NUNES, RUIKSON S. O.},  year={2020},  month={May},  pages={371–380} }