@incollection{AST_1973__2-3__171_0,
     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 = {http://archive.numdam.org/item/AST_1973__2-3__171_0/}
}