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Essential spectrum of elliptic systems of pseudo-differential operators on $$L^2({{\mathbb {R}}}^N) \oplus L^2({{\mathbb {R}}}^N)$$ L 2 ( R N ) ⊕ L 2 ( R N )

Crossref DOI link: https://doi.org/10.1007/s11868-017-0198-8

Published Online: 2017-03-24

Published Print: 2017-06

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