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Necas, Jindrich 1929-2002, Gérard 1934-2017 Tronel, Alois 1934- Kufner, Sárka 1965- Necasová, and Christian G. 1943- Simader. Direct Methods in the Theory of Elliptic Equations. Berlin: Springer, 2012.

Necas, Jindrich 1929-2002, et al. Direct Methods in the Theory of Elliptic Equations. Berlin: Springer, 2012.