@article{JFAA_2001__7_4_59677,
     author = {Fernando Reitich and Oscar P. Bruno},
     title = {Boundary-Variation {Solution} of {Eigenvalue} {Problems} for {Elliptic} {Operators.}},
     journal = {The journal of Fourier analysis and applications [[Elektronische Ressource]]},
     pages = {169--188},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {2001},
     zbl = {1108.35379},
     url = {http://geodesic.mathdoc.fr/item/JFAA_2001__7_4_59677/}
}