@article{02236237, title = {The integral equation methods for the perturbed Helmholtz eigenvalue problems.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2005}, year = {2005}, pages = {1201-1220}, doi = {10.1155/IJMMS.2005.1201}, zbl = {1130.45001}, language = {en}, url = {http://dml.mathdoc.fr/item/02236237} }
Khelifi, Abdessatar. The integral equation methods for the perturbed Helmholtz eigenvalue problems.. International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 1201-1220. doi : 10.1155/IJMMS.2005.1201. http://gdmltest.u-ga.fr/item/02236237/