@article{JEDP_1987____A2_0, author = {Lerner, Nicolas}, title = {Sufficiency of condition ($\psi $) for local solvability in two dimensions}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, year = {1987}, pages = {1-23}, mrnumber = {89e:35150}, zbl = {0636.58032}, language = {en}, url = {http://dml.mathdoc.fr/item/JEDP_1987____A2_0} }
Lerner, Nicolas. Sufficiency of condition ($\psi $) for local solvability in two dimensions. Journées équations aux dérivées partielles, (1987), pp. 1-23. http://gdmltest.u-ga.fr/item/JEDP_1987____A2_0/
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