Sobolev spaces of variable order and problems of convexity for partial differential operators with constant coefficients
Colloque International C.N.R.S. sur les équations aux dérivées partielles linéaires, Astérisque, no. 2-3 (1973), pp. 325-341.
@incollection{AST_1973__2-3__325_0,
     author = {Unterberger, Andr\'e},
     title = {Sobolev spaces of variable order and problems of convexity for partial differential operators with constant coefficients},
     booktitle = {Colloque International C.N.R.S. sur les \'equations aux d\'eriv\'ees partielles lin\'eaires},
     series = {Ast\'erisque},
     pages = {325--341},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {2-3},
     year = {1973},
     mrnumber = {393774},
     zbl = {0278.46034},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1973__2-3__325_0/}
}
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%A Unterberger, André
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%A Collectif
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%F AST_1973__2-3__325_0
Unterberger, André. Sobolev spaces of variable order and problems of convexity for partial differential operators with constant coefficients, dans Colloque International C.N.R.S. sur les équations aux dérivées partielles linéaires, Astérisque, no. 2-3 (1973), pp. 325-341. http://archive.numdam.org/item/AST_1973__2-3__325_0/