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https://research.uni-hannover.de/de/publications/a-matrix-free-isogeometric-galerkin-method-for-karhunenlo%C3%A8ve-appr/ A matrix-free isogeometric Galerkin method for Karhunen–Loève approximation of random fields using... galerkin method random fields matrix free isogeometric https://cuvillier.de/de/shop/publications/5042-spline-galerkin-approximation-elliptischer-randwertprobleme Spline-Galerkin-Approximation elliptischer Randwertprobleme – Cuvillier Verlag galerkin approximation cuvillier verlag spline elliptischer