no. 1-2
Mixed problems for higher order elliptic equations in two variables, II
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 17 (1963) no. 1-2, pp. 1-12. 
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     author = {Peetre, Jaak},
     title = {Mixed problems for higher order elliptic equations in two variables, {II}},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
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     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 17},
     number = {1-2},
     year = {1963},
     mrnumber = {157088},
     zbl = {0115.31602},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1963_3_17_1-2_1_0/}
}
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Peetre, Jaak. Mixed problems for higher order elliptic equations in two variables, II. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 17 (1963) no. 1-2, pp. 1-12. http://archive.numdam.org/item/ASNSP_1963_3_17_1-2_1_0/

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