Geodesic
The Spectrum of Positive Elliptic Operators and Periodic Bicharacteristics.
Inventiones mathematicae, Tome 29 (1975), pp. 39-80.

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@article{IM_1975__29_142329,
     author = {J.J. Duistermaat and V.W. Guillemin},
     title = {The {Spectrum} of {Positive} {Elliptic} {Operators} and {Periodic} {Bicharacteristics.}},
     journal = {Inventiones mathematicae},
     pages = {39--80},
     publisher = {mathdoc},
     volume = {29},
     year = {1975},
     zbl = {0307.35071},
     url = {http://geodesic.mathdoc.fr/item/IM_1975__29_142329/}
}
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J.J. Duistermaat; V.W. Guillemin. The Spectrum of Positive Elliptic Operators and Periodic Bicharacteristics.. Inventiones mathematicae, Tome 29 (1975), pp. 39-80. http://geodesic.mathdoc.fr/item/IM_1975__29_142329/