@article{1183528178,
author = {Clark, Colin},
title = {An asymptotic formula for the eigenvalues of the Laplacian operator in an unbounded domain},
journal = {Bull. Amer. Math. Soc.},
volume = {72},
number = {4},
year = {1966},
pages = { 709-712},
language = {en},
url = {http://dml.mathdoc.fr/item/1183528178}
}
Clark, Colin. An asymptotic formula for the eigenvalues of the Laplacian operator in an unbounded domain. Bull. Amer. Math. Soc., Tome 72 (1966) no. 4, pp. 709-712. http://gdmltest.u-ga.fr/item/1183528178/