A remark on ellipticity of systems of linear partial differential equations with constant coefficients
Analytic solutions of partial differential equations - Trento, 1981, Astérisque, no. 89-90 (1981), 12 p. 
@incollection{AST_1981__89-90__117_0,
     author = {Abramczuk, W.},
     title = {A remark on ellipticity of systems of linear partial differential equations with constant coefficients},
     booktitle = {Analytic solutions of partial differential equations - Trento, 1981},
     author = {Collectif},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {89-90},
     year = {1981},
     zbl = {0532.35008},
     mrnumber = {666405},
     language = {en},
     url = {archive.numdam.org/item/AST_1981__89-90__117_0/}
}
Abramczuk, W. A remark on ellipticity of systems of linear partial differential equations with constant coefficients, dans Analytic solutions of partial differential equations - Trento, 1981, Astérisque, no. 89-90 (1981), 12 p. http://archive.numdam.org/item/AST_1981__89-90__117_0/

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