MR803403
Butler, G. J. and Erbe, L. H.
null
Oscillation theory for second order differential systems with functionally commutative matrix coefficients
Funkcialaj Ekvacioj. Serio Internacia
28
1985
47--55
http://fe.math.kobe-u.ac.jp/FE/FullPapers/vol28/fe28-1-4.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe28-047-055/fe28-047-055.pdf
http://www.ams.org/mathscinet-getitem?mr=MR803403
fe28-047-055
1985
Oscillation Theory for Second Order Differential Systems with Functionally Commutative Matrix Coefficients
BUTLER, G. J.; ERBE, L. H.
BUTLER, G. J.; ERBE, L. H.
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