Teplinskij, Yu. V. On the smoothness of the invariant toroidal manifold of a countable system of differential equations. (Russian) Zbl 0447.34043 Mat. Fiz. 23, 32-39 (1978). MSC: 34C30 34A99 53C20 PDFBibTeX XMLCite \textit{Yu. V. Teplinskij}, Mat. Fiz. 23, 32--39 (1978; Zbl 0447.34043)
Teplinskij, Yu. V. On the reducibility of countable systems of differential equations. (Russian) Zbl 0447.34037 Mat. Fiz. 22, 47-54 (1977). MSC: 34C20 34A30 34A34 PDFBibTeX XMLCite \textit{Yu. V. Teplinskij}, Mat. Fiz. 22, 47--54 (1977; Zbl 0447.34037)