@inproceedings{chi2017a,
title={A phase-based interior penalty discontinuous Galerkin method for the Helmholtz equation with spatially varying wavenumber},
author={Chi Yeung Lam, and Chi-Wang Shu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180416093113380488041},
booktitle={Computer Methods in Applied Mechanics and Engineering},
volume={318},
pages={456-473},
year={2017},
}
Chi Yeung Lam, and Chi-Wang Shu. A phase-based interior penalty discontinuous Galerkin method for the Helmholtz equation with spatially varying wavenumber. 2017. Vol. 318. In Computer Methods in Applied Mechanics and Engineering. pp.456-473. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180416093113380488041.