@Article{NM-14-56,
author = {T. Hong and C. Xu},
title = {Spectral element method for the Helmholtz equation},
journal = {Numerical Mathematics, a Journal of Chinese Universities},
year = {2015},
volume = {14},
number = {1},
pages = {56--66},
abstract = {},
issn = {},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/nm/8001.html}
}