A Non Solvable Operator Satisfying Condition (ψ)
Publications de l'Institut de recherche mathématiques de Rennes, Fascicule d'équations aux dérivées partielles, no. 1 (1992), pp. 151-184. 
@article{PSMIR_1992___1_151_0,
     author = {Lerner, Nicolas},
     title = {A {Non} {Solvable} {Operator} {Satisfying} {Condition} $(\psi )$},
     journal = {Publications de l'Institut de recherche math\'ematiques de Rennes},
     pages = {151--184},
     publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes},
     number = {1},
     year = {1992},
     language = {en},
     url = {http://www.numdam.org/item/PSMIR_1992___1_151_0/}
}
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Lerner, Nicolas. A Non Solvable Operator Satisfying Condition $(\psi )$. Publications de l'Institut de recherche mathématiques de Rennes, Fascicule d'équations aux dérivées partielles, no. 1 (1992), pp. 151-184. http://www.numdam.org/item/PSMIR_1992___1_151_0/

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