@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/}
}