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@article{CMH_1977__52_139713, author = {Robert Osserman}, title = {A note on {Hayman's} theorem on the bass note of a drum.}, journal = {Commentarii mathematici Helvetici}, pages = {545--556}, publisher = {mathdoc}, volume = {52}, year = {1977}, zbl = {0374.52008}, url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139713/} }
Robert Osserman. A note on Hayman's theorem on the bass note of a drum.. Commentarii mathematici Helvetici, Tome 52 (1977), pp. 545-556. http://geodesic.mathdoc.fr/item/CMH_1977__52_139713/