The Spectrum of Positive Elliptic Operators and Periodic Bicharacteristics.
Duistermaat, J.J. ; Guillemin, V.W.
Inventiones mathematicae, Tome 29 (1975), p. 39-80 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1975-01-01
EUDML-ID : urn:eudml:doc:142329 
@article{GDZPPN002091763,
     title = {The Spectrum of Positive Elliptic Operators and Periodic Bicharacteristics.},
     journal = {Inventiones mathematicae},
     volume = {29},
     year = {1975},
     pages = {39-80},
     zbl = {0307.35071},
     url = {http://dml.mathdoc.fr/item/GDZPPN002091763}
}

Duistermaat, J.J.; Guillemin, V.W. The Spectrum of Positive Elliptic Operators and Periodic Bicharacteristics.. Inventiones mathematicae, Tome 29 (1975) pp. 39-80. http://gdmltest.u-ga.fr/item/GDZPPN002091763/