The L p approach to the Dirichlet problem. Part I : regularity theorems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 13 (1959) no. 4, p. 405-448 
@article{ASNSP_1959_3_13_4_405_0,
     author = {Agmon, Shmuel},
     title = {The $L\_p$ approach to the Dirichlet problem. Part I : regularity theorems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 13},
     number = {4},
     year = {1959},
     pages = {405-448},
     zbl = {0093.10601},
     mrnumber = {125306},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1959_3_13_4_405_0}
}

Agmon, Shmuel. The $L_p$ approach to the Dirichlet problem. Part I : regularity theorems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 13 (1959) no. 4, pp. 405-448. http://www.numdam.org/item/ASNSP_1959_3_13_4_405_0/

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