A non solvable operator satisfying condition (Ψ)
Séminaire Goulaouic-Schwartz (1991-1992), Exposé no. 12, 22 p. 
@article{SEDP_1991-1992____A12_0,
     author = {Lerner, Nicolas},
     title = {A non solvable operator satisfying condition ($\Psi $)},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:12},
     pages = {1--22},
     year = {1991-1992},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     language = {en},
     url = {https://www.numdam.org/item/SEDP_1991-1992____A12_0/}
}
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Lerner, Nicolas. A non solvable operator satisfying condition ($\Psi $). Séminaire Goulaouic-Schwartz (1991-1992), Exposé no. 12, 22 p.. https://www.numdam.org/item/SEDP_1991-1992____A12_0/

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