@article{GDZPPN002105411,
title = {Nodal sets of eigenfunctions on Riemannian manifolds.},
journal = {Inventiones mathematicae},
volume = {93},
year = {1988},
pages = {161-184},
zbl = {0659.58047},
url = {http://dml.mathdoc.fr/item/GDZPPN002105411}
}
Donnelly, Harold; Fefferman, Charles. Nodal sets of eigenfunctions on Riemannian manifolds.. Inventiones mathematicae, Tome 93 (1988) pp. 161-184. http://gdmltest.u-ga.fr/item/GDZPPN002105411/