Chen, Xiu Singular perturbation of Robin problems for second order nonlinear equations with turning points. (English) Zbl 0935.34051 Math. Appl. 10, No. 2, 1-7 (1997). MSC: 34E15 34E20 34B15 PDFBibTeX XMLCite \textit{X. Chen}, Math. Appl. 10, No. 2, 1--7 (1997; Zbl 0935.34051)
Zhang, Xiang Singular perturbation for nonlinear vector problems with turning points. (Chinese. English summary) Zbl 0892.34051 Math. Appl. 4, No. 3, 56-62 (1991). MSC: 34E20 34B15 34E05 PDFBibTeX XMLCite \textit{X. Zhang}, Math. Appl. 4, No. 3, 56--62 (1991; Zbl 0892.34051)
Chen, Xiu Singularly perturbed nonlinear boundary value problems with turning points. (Chinese. English summary) Zbl 0892.34050 Math. Appl. 4, No. 3, 36-42 (1991). MSC: 34E20 PDFBibTeX XMLCite \textit{X. Chen}, Math. Appl. 4, No. 3, 36--42 (1991; Zbl 0892.34050)