Sufficiency of condition ($\psi$) for local solvability in two dimensions
Journées équations aux dérivées partielles, (1987), article no. 2, 23 p.
@article{JEDP_1987____A2_0,
author = {Lerner, Nicolas},
title = {Sufficiency of condition ($\psi$) for local solvability in two dimensions},
journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
publisher = {Ecole polytechnique},
year = {1987},
zbl = {0636.58032},
mrnumber = {89e:35150},
language = {en},
url = {http://www.numdam.org/item/JEDP_1987____A2_0}
}

Lerner, Nicolas. Sufficiency of condition ($\psi$) for local solvability in two dimensions. Journées équations aux dérivées partielles,  (1987), article  no. 2, 23 p. http://www.numdam.org/item/JEDP_1987____A2_0/

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