no. 2
Regular inversion of the divergence operator with Dirichlet boundary conditions on a polygon
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 15 (1988) no. 2, pp. 169-192. 
@article{ASNSP_1988_4_15_2_169_0,
     author = {Arnold, Douglas N. and Scott, L. Ridgway and Vogelius, Michael},
     title = {Regular inversion of the divergence operator with {Dirichlet} boundary conditions on a polygon},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {169--192},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 15},
     number = {2},
     year = {1988},
     mrnumber = {1007396},
     zbl = {0702.35208},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1988_4_15_2_169_0/}
}
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Arnold, Douglas N.; Scott, L. Ridgway; Vogelius, Michael. Regular inversion of the divergence operator with Dirichlet boundary conditions on a polygon. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 15 (1988) no. 2, pp. 169-192. http://www.numdam.org/item/ASNSP_1988_4_15_2_169_0/

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