Sufficiency of condition (ψ) for local solvability in two dimensions
Journées équations aux dérivées partielles (1987), article no. 2, 23 p. 
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     author = {Nicolas Lerner},
     title = {Sufficiency of condition ($\psi $) for local solvability in two dimensions},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {2},
     pages = {1--23},
     publisher = {\'Ecole polytechnique},
     year = {1987},
     zbl = {0636.58032},
     mrnumber = {89e:35150},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1987____A2_0/}
}
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Nicolas Lerner. Sufficiency of condition ($\psi $) for local solvability in two dimensions. Journées équations aux dérivées partielles (1987), article  no. 2, 23 p. https://proceedings.centre-mersenne.org/item/JEDP_1987____A2_0/

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