@article{GDZPPN002342634,
title = {On the asymptotic distribution of the eigenvalues and eigenfunctions of elliptic differential operators},
journal = {Mathematica Scandinavica},
volume = {1},
year = {1953},
pages = {237-255},
zbl = {0053.39102},
url = {http://dml.mathdoc.fr/item/GDZPPN002342634}
}
GARDING, Lars. On the asymptotic distribution of the eigenvalues and eigenfunctions of elliptic differential operators. Mathematica Scandinavica, Tome 1 (1953) pp. 237-255. http://gdmltest.u-ga.fr/item/GDZPPN002342634/