On the formal fundamental solution of a differential equation depending on a parameter

MR1065465 Sch{\"a}fke, R. and Volkmer, H. R. SCHÄFKE and H. VOLKMER On the formal fundamental solution of a differential equation depending on a parameter Funkcialaj Ekvacioj. Serio Internacia 33 1990 1--17 http://fe.math.kobe-u.ac.jp/FE/Free/vol33/fe33-1-1.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE31-34-en_KML/fe33-001-017/fe33-001-017.pdf http://www.ams.org/mathscinet-getitem?mr=MR1065465 fe33-001-017 1990 On the Formal Fundamental Solution of a Differential Equation Depending on a Parameter SCH\"{A}FKE, R.; VOLKMER, H. SCH\"{A}FKE, R.; VOLKMER, H. 1 Baumgärtel, H. Analytic Perturbation Theory for Matrices and Operators Birkhäuser, Basel 1985 MR0878974 100 Cache/Ba/Baumg\"artel,Perturbation,*,1985,1986 427

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