@article{Bag-Cha-Cia-2022,
    author={Laura Bagur and Stéphanie Chaillat and Patrick Ciarlet },
    title={Improvement of hierarchical matrices for 3D elastodynamic 
           problems with a complex wavenumber },
    doi={10.1007/s10444-021-09921-3 },
    journal={Advances in Computational Mathematics },
    year={2022 },
    month={2},
    volume={48 },
}