Papers
- Walter Ritz (1909) "Über eine neue Methode zur Lösung gewisser Variationsprobleme der mathematischen Physik" Journal für die Reine und Angewandte Mathematik, vol. 135, pages 1–61. Available on-line at: http://gdz.sub.uni-goettingen.de/no_cache/dms/load/img/?IDDOC=261182 .
- J.K. MacDonald, "Successive Approximations by the Rayleigh–Ritz Variation Method", Phys. Rev. 43 (1933) 830
Read more about this topic: Ritz Method
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