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

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