Mixed boundary value problems for elliptic equations in the plane. The L p theory
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 17 (1963) no. 1-2, p. 117-139 
@article{ASNSP_1963_3_17_1-2_117_0,
     author = {Shamir, E.},
     title = {Mixed boundary value problems for elliptic equations in the plane. The $L^p$ theory},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 17},
     number = {1-2},
     year = {1963},
     pages = {117-139},
     zbl = {0117.07002},
     mrnumber = {157089},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1963_3_17_1-2_117_0}
}

Shamir, E. Mixed boundary value problems for elliptic equations in the plane. The $L^p$ theory. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 17 (1963) no. 1-2, pp. 117-139. http://www.numdam.org/item/ASNSP_1963_3_17_1-2_117_0/

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