The problem of singular perturbations of linear ordinary differential equations at regular singular points. I

MR0214869 Russell, David L. and Sibuya, Yasutaka David L. RUSSELL and Yasutaka SIBUYA The problem of singular perturbations of linear ordinary differential equations at regular singular points. I Funkcialaj Ekvacioj. Serio Internacia 9 1966 207--218 http://fe.math.kobe-u.ac.jp/FE/Free/vol09/fe09-27.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE01-10-en_KML/fe09-207-218/fe09-207-218.pdf http://www.ams.org/mathscinet-getitem?mr=MR0214869 fe09-207-218 1966 The Problem of Singular Perturbations of Linear Ordinary Differential Equations at Regular Singular Points, I RUSSELL, David L.; SIBUYA, Yasutaka RUSSELL, David L.; SIBUYA, Yasutaka

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