@article{GDZPPN002330296,
title = {Equivalence of Boundary Eigenvalue Operator Fuctions and their Characteristic Matrix Functions.},
journal = {Mathematische Annalen},
volume = {277},
year = {1987},
pages = {267-276},
zbl = {0613.47011},
url = {http://dml.mathdoc.fr/item/GDZPPN002330296}
}
Mennicken, Reinhard; Möller, Manfred. Equivalence of Boundary Eigenvalue Operator Fuctions and their Characteristic Matrix Functions.. Mathematische Annalen, Tome 277 (1987) pp. 267-276. http://gdmltest.u-ga.fr/item/GDZPPN002330296/