@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 - Scienze Fisiche e Matematiche},
     pages = {405--448},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 13},
     number = {4},
     year = {1959},
     mrnumber = {125306},
     zbl = {0093.10601},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1959_3_13_4_405_0/}
}