BibTex format
@article{Cimpeanu:2015:10.1016/j.jcp.2015.05.006,
author = {Cimpeanu, R and Martinsson, A and Heil, M},
doi = {10.1016/j.jcp.2015.05.006},
journal = {Journal of Computational Physics},
pages = {329--347},
title = {A parameter-free perfectly matched layer formulation for the finite-element-based solution of the Helmholtz equation},
url = {http://dx.doi.org/10.1016/j.jcp.2015.05.006},
volume = {296},
year = {2015}
}