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Avdonin, S. A.; Ivanov, S. A.; Joó, I. Family of exponents and controllability of a rectangular membrane. (Russian) Zbl 0743.93015 Stud. Sci. Math. Hung. 25, No. 3, 291-306 (1990). Reviewer: Ts.Y.Tsachev (Sofia) MSC: 93B05 49K20 35B65 49K27 PDFBibTeX XMLCite \textit{S. A. Avdonin} et al., Stud. Sci. Math. Hung. 25, No. 3, 291--306 (1990; Zbl 0743.93015)
Avdonin, S. A.; Ivanov, S. A.; Joó, I. On a theorem of N. K. Bari. (English) Zbl 0711.47014 Stud. Sci. Math. Hung. 24, No. 2-3, 295-261 (1989). Reviewer: A.Torgašev MSC: 47A57 47A70 47A67 PDFBibTeX XMLCite \textit{S. A. Avdonin} et al., Stud. Sci. Math. Hung. 24, No. 2--3, 295--261 (1989; Zbl 0711.47014)