@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}, pages = {117-128}, zbl = {0532.35008}, mrnumber = {666405}, language = {en}, url = {http://www.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, inAnalytic solutions of partial differential equations - Trento, 1981, Astérisque, no. 89-90 (1981), pp. 117-128. http://www.numdam.org/item/AST_1981__89-90__117_0/

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