Geodesic
The Essential Spectrum of Elliptic Systems of Mixed Order.
Mathematische Annalen, Tome 227 (1977), pp. 247-276.

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     author = {Gerd Grubb and Giuseppe Geymonat},
     title = {The {Essential} {Spectrum} of {Elliptic} {Systems} of {Mixed} {Order.}},
     journal = {Mathematische Annalen},
     pages = {247--276},
     publisher = {mathdoc},
     volume = {227},
     year = {1977},
     zbl = {0361.35050},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__227_162979/}
}
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Gerd Grubb; Giuseppe Geymonat. The Essential Spectrum of Elliptic Systems of Mixed Order.. Mathematische Annalen, Tome 227 (1977), pp. 247-276. http://geodesic.mathdoc.fr/item/MAN_1977__227_162979/