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2. Convergence rates of iterative treatments of partial differential equations;Frankel;Mathematical Tables and Other Aids to Computation,1950
3. Über eine neue Methode zur Lösung gewisser Variationsprobleme der mathematischen Physik;Ritz;Journal für die Reine und Angewandte Mathematik,1909
4. Variational methods for the solution of problems of equilibrium and vibrations;Courant;Bulletin of the American Mathematical Society,1943
5. The Finite Element Method in Plane Stress Analysis;Clough,1960