Leszek Demkowicz
Josselin Garnier
josselin-garnier.org/teaching/zss16/
Ralf Hiptmair
R. Hiptmair, A. Moiola, I. Perugia: Survey of Trefftz Methods for the Helmholtz Equation
SAM Report 2015-20.
https://www.sam.math.ethz.ch/sam_reports/reports_final/reports2015/2015-20.pdf
R. Hiptmair, A. Moiola, I. Perugia: Plane Wave Discontinuous Galerkin Methods: Exponential Convergence of the hp-Version
Foundations of Computational Mathematics, 16(3), pp. 637–675, 2016.
Also
SAM Report 2013-31
https://www.sam.math.ethz.ch/sam_reports/reports_final/.../2013-31_rev1.pdf
A. Lieu, G. Gabard, H. Beriot: Comparison of high-order polynomial and wave-based methods for Helmholtz problems
Journal of Computational Physics, 321, pp. 105–125, 2016
http://www.sciencedirect.com/science/article/pii/S0021999116301905
Stefan Sauter
Christian Wieners