Kudryavtsev, L. D. Variational problems with free endpoints on bounded and unbounded intervals. (English. Russian original) Zbl 0692.49001 Proc. Steklov Inst. Math. 181, 149-159 (1989); translation from Tr. Mat. Inst. Steklova 181, 137-146 (1988). MSC: 49J15 46E30 49S05 PDFBibTeX XMLCite \textit{L. D. Kudryavtsev}, Proc. Steklov Inst. Math. 181, 149--159 (1989; Zbl 0692.49001); translation from Tr. Mat. Inst. Steklova 181, 137--146 (1988)
Lorentz, G. G. Solvability of multivariate interpolation. (English) Zbl 0666.41003 J. Reine Angew. Math. 398, 101-104 (1989). Reviewer: G.G.Lorentz MSC: 41A05 PDFBibTeX XMLCite \textit{G. G. Lorentz}, J. Reine Angew. Math. 398, 101--104 (1989; Zbl 0666.41003) Full Text: DOI Crelle EuDML