On Veech's conjecture for harmonic functions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 22 (1995) no. 1, pp. 137-153. 
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     title = {On {Veech's} conjecture for harmonic functions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {137--153},
     publisher = {Scuola normale superiore},
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Hansen, W.; Nadirashvili, N. On Veech's conjecture for harmonic functions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 22 (1995) no. 1, pp. 137-153. http://archive.numdam.org/item/ASNSP_1995_4_22_1_137_0/

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