@article{10_21136_AM_1968_103145,
     author = {Isaacson, Eugene and Keller, J. B. and Logemann, George},
     title = {The eigenvalues and eigenfunctions of the elliptical membrane},
     journal = {Applications of Mathematics},
     pages = {147},
     year = {1968},
     volume = {13},
     number = {2},
     doi = {10.21136/AM.1968.103145},
     zbl = {0153.46203},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1968.103145/}
}