A non solvable operator satisfying condition (Ψ)
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1991-1992), Exposé no. 12, 22 p.
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     author = {Lerner, Nicolas},
     title = {A non solvable operator satisfying condition ($\Psi $)},
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     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1991-1992},
     language = {en},
     url = {http://archive.numdam.org/item/SEDP_1991-1992____A12_0/}
}
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Lerner, Nicolas. A non solvable operator satisfying condition ($\Psi $). Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1991-1992), Exposé no. 12, 22 p. http://archive.numdam.org/item/SEDP_1991-1992____A12_0/

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