MR1065465
Sch{\"a}fke, R. and Volkmer, H.
null
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/FullPapers/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.
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Baumg\"artel, H.
Analytic Perturbation Theory for Matrices and Operators
Birkh\"auser, Basel
1985
MR878974
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Hukuhara, M.
Sur les propri\'et\'es asymptotiques des solutions d'un syst\`eme d'e'quations diff\'erentielles lin\'eares contenant un param\`etre
M\'em. Fac. Sci. Kyushu Imp. Univ.
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MR771669
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