no. 1-2
Properties of normal boundary problems for elliptic even-order systems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 1 (1974) no. 1-2, pp. 1-61. 
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     title = {Properties of normal boundary problems for elliptic even-order systems},
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     zbl = {0309.35034},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1974_4_1_1-2_1_0/}
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Grubb, Gerd. Properties of normal boundary problems for elliptic even-order systems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 1 (1974) no. 1-2, pp. 1-61. http://archive.numdam.org/item/ASNSP_1974_4_1_1-2_1_0/

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