Quasiharmonic fields
Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 5, pp. 519-572.
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     author = {Iwaniec, Tadeusz and Sbordone, Carlo},
     title = {Quasiharmonic fields},
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Iwaniec, Tadeusz; Sbordone, Carlo. Quasiharmonic fields. Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 5, pp. 519-572. http://www.numdam.org/item/AIHPC_2001__18_5_519_0/

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