@article {cohen2004consolidating,
	title = {Consolidating boundary methods for finding the eigenstates of billiards},
	journal = {Journal of Physics A: Mathematical and General},
	volume = {37},
	year = {2004},
	pages = {2139},
	publisher = {IOP Publishing},
	abstract = {The plane-wave decomposition method, a widely used means of numerically finding eigenstates of the Helmholtz equation in billiard systems is described as a variant of the mathematically well-established boundary integral method (BIM). A new unified framework encompassing the two methods is discussed. Furthermore, a third numerical method, which we call the gauge freedom method is derived from the BIM equations. This opens the way to further improvements in eigenstate search techniques.},
	url = {http://dx.doi.org/10.1088/0305-4470/37/6/013},
	author = {Cohen, Doron and Lepore, Natasha and Heller, EricJ.}
}
