Piatetski-Shapiro, Ilya I. Fractional parts and some problems of the theory of trigonometric series. (Russian) Zbl 0053.22102 Usp. Mat. Nauk 8, No. 3(55), 167-170 (1953). MSC: 11J54 42A05 PDFBibTeX XMLCite \textit{I. I. Piatetski-Shapiro}, Usp. Mat. Nauk 8, No. 3(55), 167--170 (1953; Zbl 0053.22102)
Koshelev, A. I. Die Differenzierbarkeit der Lösungen einiger Aufgaben der Potentialtheorie. (Russian) Zbl 0050.32303 Mat. Sb., N. Ser. 32(74), 653-664 (1953). Reviewer: Lars Gårding MSC: 35J08 31A15 PDFBibTeX XMLCite \textit{A. I. Koshelev}, Mat. Sb., Nov. Ser. 32(74), 653--664 (1953; Zbl 0050.32303)