An Iff solvability condition for the oblique derivative problem
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1990-1991), Exposé no. 18, 7 p. 
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     author = {Lerner, N.},
     title = {An {Iff} solvability condition for the oblique derivative problem},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:18},
     pages = {1--7},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1990-1991},
     mrnumber = {1131591},
     zbl = {0737.35171},
     language = {en},
     url = {http://archive.numdam.org/item/SEDP_1990-1991____A18_0/}
}
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Lerner, N. An Iff solvability condition for the oblique derivative problem. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1990-1991), Exposé no. 18, 7 p. http://archive.numdam.org/item/SEDP_1990-1991____A18_0/

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