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2022. Directional $\mathcal{H}^2$ Compression Algorithm: Optimisations and Application to a Discontinuous Galerkin BEM for the Helmholtz Equation. Communications in Computational Physics. 31, 5 (May 2022), 1585–1635. DOI:https://doi.org/10.4208/cicp.OA-2021-0241.