ハルトークスの拡張定理
1007/BF03024609, MR1907191 . An historical paper correcting some inexact historical statements in the theory of holomorphic functions of several variables, particularly concerning contributions of Gaetano Fichera and Francesco Severi.
Severi, Francesco (1931), “Risoluzione del problema generale di Dirichlet per le funzioni biarmoniche” (Italian), Rendiconti della Accademia Nazionale dei Lincei, Classe di Scienze Fisiche, Matematiche e Naturali, series 6, 13: 795–804, JFM 57.0393.01, Zbl 0002.34202 . This is the first paper where a general solution to the Dirichlet problem for pluriharmonic functions is solved for general real analyitic data on a real analytic hypersurface.