Sprindzhuk, V. G. Advances and problems of the theory of Diophantine approximations. (Russian) Zbl 0438.10024 Usp. Mat. Nauk 35, No. 4(214), 3-68 (1980). MSC: 11Jxx 11Kxx 11-02 11D41 11R23 PDFBibTeX XMLCite \textit{V. G. Sprindzhuk}, Usp. Mat. Nauk 35, No. 4(214), 3--68 (1980; Zbl 0438.10024)
Khinchin, A. Ya. Dirichlet’s principle in the theory of Diophantine approximations. (Russian) Zbl 1519.11039 Usp. Mat. Nauk 3, No. 3(25), 3-28 (1948). MSC: 11J04 PDFBibTeX XMLCite \textit{A. Ya. Khinchin}, Usp. Mat. Nauk 3, No. 3(25), 3--28 (1948; Zbl 1519.11039) Full Text: MNR