MR0239162
Harris, Jr., W. A. and Sibuya, Y. and Weinberg, L.
W. A. HARRIS, Jr., Y. SIBUYA and L. WEINBERG
A reduction algorithm for linear differential systems
Funkcialaj Ekvacioj. Serio Internacia
11
1968
59--67
http://fe.math.kobe-u.ac.jp/FE/Free/vol11/fe11-4.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe11-059-067/fe11-059-067.pdf
http://www.ams.org/mathscinet-getitem?mr=MR0239162
fe11-059-067
1968
A Reduction Algorithm for Linear Differential Systems
HARRIS, W. A. Jr.; SIBUYA, Y.; WEINBERG, L.
HARRIS, W. A. Jr.; SIBUYA, Y.; WEINBERG, L.
1
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1955
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Funkcia. Ekvac.
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1961
MR0124549