Systèmes elliptiques ayant un spectre essentiel
Séminaire Goulaouic-Schwartz (1972-1973), Talk no. 27, 11 p. 
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     author = {Grubb, G.},
     title = {Syst\`emes elliptiques ayant un spectre essentiel},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:27},
     pages = {1--11},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1972-1973},
     mrnumber = {410074},
     zbl = {0274.35034},
     language = {fr},
     url = {https://www.numdam.org/item/SEDP_1972-1973____A28_0/}
}
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Grubb, G. Systèmes elliptiques ayant un spectre essentiel. Séminaire Goulaouic-Schwartz (1972-1973), Talk no. 27, 11 p.. https://www.numdam.org/item/SEDP_1972-1973____A28_0/

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