Inequalities for boundary value problems for systems of partial differential operators
Colloque International C.N.R.S. sur les équations aux dérivées partielles linéaires, Astérisque, no. 2-3 (1973), pp. 171-187 
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     author = {Grubb, Gerd},
     title = {Inequalities for boundary value problems for systems of partial differential operators},
     booktitle = {Colloque International C.N.R.S. sur les \'equations aux d\'eriv\'ees partielles lin\'eaires},
     series = {Ast\'erisque},
     pages = {171--187},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {2-3},
     year = {1973},
     zbl = {0267.35026},
     language = {en},
     url = {https://www.numdam.org/item/AST_1973__2-3__171_0/}
}
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Grubb, Gerd. Inequalities for boundary value problems for systems of partial differential operators, in Colloque International C.N.R.S. sur les équations aux dérivées partielles linéaires, Astérisque, no. 2-3 (1973), pp. 171-187. https://www.numdam.org/item/AST_1973__2-3__171_0/

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