Perkin, A. A.; Smirnova, V. B.; Utina, N. V.; Shepelyavyi, A. I. Application of the method of Lyapunov periodic functions. (English. Russian original) Zbl 1251.93113 Vestn. St. Petersbg. Univ., Math. 44, No. 3, 197-207 (2011); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2011, No. 3, 36-47 (2011). MSC: 93D20 93C30 93D05 PDFBibTeX XMLCite \textit{A. A. Perkin} et al., Vestn. St. Petersbg. Univ., Math. 44, No. 3, 197--207 (2011; Zbl 1251.93113); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2011, No. 3, 36--47 (2011) Full Text: DOI
Smirnova, V. B.; Utina, N. V.; Shepelyavyi, A. I.; Perkin, A. A. Coordinatewise estimates for vector outputs of multivariable phase control systems. (English. Russian original) Zbl 1175.93113 Vestn. St. Petersbg. Univ., Math. 42, No. 3, 212-218 (2009); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2009, No. 3, 70-78 (2009). MSC: 93C35 93D30 15A39 PDFBibTeX XMLCite \textit{V. B. Smirnova} et al., Vestn. St. Petersbg. Univ., Math. 42, No. 3, 212--218 (2009; Zbl 1175.93113); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2009, No. 3, 70--78 (2009) Full Text: DOI
Smirnova, V. B.; Utina, N. V.; Shepelyavyi, A. I.; Perkin, A. A. Frequency estimates for the number of cycle slippings in a phase system with nonlinear vector function. (English. Russian original) Zbl 1172.93016 Vestn. St. Petersbg. Univ., Math. 42, No. 1, 28-36 (2009); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2009, No. 1, 33-43 (2009). MSC: 93C10 93D05 PDFBibTeX XMLCite \textit{V. B. Smirnova} et al., Vestn. St. Petersbg. Univ., Math. 42, No. 1, 28--36 (2009; Zbl 1172.93016); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2009, No. 1, 33--43 (2009) Full Text: DOI