MR0417710 DeFranco, R. J. R. J. DEFRANCO Gronwall's inequality for systems of multiple Volterra integral equations Funkcialaj Ekvacioj. Serio Internacia 19 1976 1--9 http://fe.math.kobe-u.ac.jp/FE/Free/vol19/fe19-1-1.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe19-001-009/fe19-001-009.pdf http://www.ams.org/mathscinet-getitem?mr=MR0417710 fe19-001-009 1976 Gronwall's Inequality for Systems of Multiple Volterra Integral Equations DEFRANCO, R. J. DEFRANCO, R. J.
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