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@article{MAN_1987__279_3_164345, author = {Harold Donnelly}, title = {Lower {Bounds} for {Eigenfunctions} on {Riemannian} {Manifolds.}}, journal = {Mathematische Annalen}, pages = {653--672}, publisher = {mathdoc}, volume = {279}, number = {3}, year = {1987}, zbl = {0619.58038}, url = {http://geodesic.mathdoc.fr/item/MAN_1987__279_3_164345/} }
Harold Donnelly. Lower Bounds for Eigenfunctions on Riemannian Manifolds.. Mathematische Annalen, Tome 279 (1987) no. 3, pp. 653-672. http://geodesic.mathdoc.fr/item/MAN_1987__279_3_164345/