@article{castro_diaz_péron_2014,  title={Equivalent absorbing boundary conditions for heterogeneous acoustic media},  volume={15},  ISSN={2179-8451},  url={https://doi.org/10.1590/S2179-84512014000300007},  DOI={10.1590/S2179-84512014000300007},  number={3},  journal={TEMA (São Carlos)},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={Castro, M.L. and Diaz, J. and Péron, V.},  year={2014},  month={Sep},  pages={301–310} }