Russell, David L.; Sibuya, Yasutaka The problem of singular perturbations of linear ordinary differential equations at regular singular points. I. (English) Zbl 0166.07703 Funkc. Ekvacioj, Ser. Int. 9, 207-218 (1966). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 7 Documents Keywords:ordinary differential equations PDFBibTeX XMLCite \textit{D. L. Russell} and \textit{Y. Sibuya}, Funkc. Ekvacioj, Ser. Int. 9, 207--218 (1966; Zbl 0166.07703)