Computational aspects of the ultra-weak variational formulation

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A comparison of wave‐based discontinuous Galerkin, ultra‐weak and least‐square methods for wave problems (2011, methodology): “‡The parameter is similar to that introduced in [12] except that its definition has been changed by a factor 0c 2 0/ so that now corresponds to a velocity.”
A review of finite-element methods for time-harmonic acoustics (2006, methodology): “The ultra-weak variational formulation [37, 38, 101] is another approach to using discontinuous local plane-wave solutions of the Helmholtz equation on each element.”
PLANE WAVE DISCONTINUOUS GALERKIN METHODS: ANALYSIS OF THE h-VERSION ∗, ∗∗ (2009, background): “On the other hand, extensive numerical experiments mainly conducted by Monk and collaborators indicate reliable convergence [21,22] for a wide range of wave propagation problems (without volume sources).”
A domain decomposition method for discontinuous Galerkin discretizations of Helmholtz problems with plane waves and Lagrange multipliers (2009, methodology): “For example, the partition of unity method [20], the ultra weak variational formulation [4, 18], a least-squares method [21], and the discontinuous enrichment/Galerkin method [8, 9] can employ plane waves.”