@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/