Kratz, Werner An extremal problem for Stokes functions in the plane. (English) Zbl 0888.35076 Analysis 17, No. 2-3, 219-225 (1997). Reviewer: O.Dementev (Chelyabinsk) MSC: 35Q30 30E20 76D07 PDFBibTeX XMLCite \textit{W. Kratz}, Analysis 17, No. 2--3, 219--225 (1997; Zbl 0888.35076) Full Text: DOI
Kratz, W.; Peyerimhoff, A. A treatment of Sturm-Liouville eigenvalue problems via Picone’s identity. (English) Zbl 0541.34013 Analysis 5, 97-152 (1985). MSC: 34L99 34A05 34B05 34C10 49R50 PDFBibTeX XMLCite \textit{W. Kratz} and \textit{A. Peyerimhoff}, Analysis 5, 97--152 (1985; Zbl 0541.34013) Full Text: DOI
Kratz, W.; Peyerimhoff, A. An elementary treatment of the theory of Sturmian eigenvalue problems. (English) Zbl 0549.34021 Analysis 4, 73-85 (1984). MSC: 34L99 34A05 34B05 34C10 49R50 PDFBibTeX XMLCite \textit{W. Kratz} and \textit{A. Peyerimhoff}, Analysis 4, 73--85 (1984; Zbl 0549.34021) Full Text: DOI
Jurkat, W. B.; Kratz, W. On optimal systems and on the structure of simultaneous Diophantine approximations. (English) Zbl 0491.10021 Analysis 1, 129-148 (1981). MSC: 11H06 11J70 PDFBibTeX XMLCite \textit{W. B. Jurkat} and \textit{W. Kratz}, Analysis 1, 129--148 (1981; Zbl 0491.10021)