MR0306674 Costello, Thomas Thomas COSTELLO On the fundamental theory of functional-differential equations Funkcialaj Ekvacioj. Serio Internacia 14 1971 177--190 http://fe.math.kobe-u.ac.jp/FE/Free/vol14/fe14-16.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe14-177-190/fe14-177-190.pdf http://www.ams.org/mathscinet-getitem?mr=MR0306674 fe14-177-190 1971 On the Fundamental Theory of Functional-Differential Equations COSTELLO, Thomas COSTELLO, Thomas
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