Khachay, O. Yu. Asymptotic problem for second-order ordinary differential equation with nonlinearity corresponding to a butterfly catastrophe. (English. Russian original) Zbl 1461.34078 J. Math. Sci., New York 252, No. 2, 247-265 (2021); translation from Itogi Nauki Tekh., Ser. Sovrem. Mat. Prilozh., Temat. Obz. 152, 125-142 (2018). Reviewer: Bertin Zinsou (Johannesburg) MSC: 34E05 34A34 34B40 34A12 34B08 PDF BibTeX XML Cite \textit{O. Yu. Khachay}, J. Math. Sci., New York 252, No. 2, 247--265 (2021; Zbl 1461.34078); translation from Itogi Nauki Tekh., Ser. Sovrem. Mat. Prilozh., Temat. Obz. 152, 125--142 (2018) Full Text: DOI OpenURL
Khachai, O. Yu. Asymptotics of a solution of a three-dimensional nonlinear wave equation near a butterfly catastrophe point. (English. Russian original) Zbl 1400.35019 Proc. Steklov Inst. Math. 301, Suppl. 1, S72-S87 (2018); translation from Tr. Inst. Mat. Mekh. (Ekaterinburg) 23, No. 2, 250-265 (2017). MSC: 35B25 35L15 35L71 PDF BibTeX XML Cite \textit{O. Yu. Khachai}, Proc. Steklov Inst. Math. 301, S72--S87 (2018; Zbl 1400.35019); translation from Tr. Inst. Mat. Mekh. (Ekaterinburg) 23, No. 2, 250--265 (2017) Full Text: DOI OpenURL