@article{04181947, title = {Hearing the shape of membranes: Further results.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {591-598}, doi = {10.1155/S0161171290000825}, zbl = {0717.35093}, language = {en}, url = {http://dml.mathdoc.fr/item/04181947} }
Zayed, E.M.E. Hearing the shape of membranes: Further results.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 591-598. doi : 10.1155/S0161171290000825. http://gdmltest.u-ga.fr/item/04181947/