@article{1077312684,
author = {Dreyfus, Tommy and Dym, Harry},
title = {Product formulas for the eigenvalues of a class of boundary value problems},
journal = {Duke Math. J.},
volume = {45},
number = {1},
year = {1978},
pages = { 15-37},
language = {en},
url = {http://dml.mathdoc.fr/item/1077312684}
}
Dreyfus, Tommy; Dym, Harry. Product formulas for the eigenvalues of a class of boundary value problems. Duke Math. J., Tome 45 (1978) no. 1, pp. 15-37. http://gdmltest.u-ga.fr/item/1077312684/