MR1130459 Freedman, H. I. and Kuang, Y. H. I. FREEDMAN and Y. KUANG Stability switches in linear scalar neutral delay equations Funkcialaj Ekvacioj. Serio Internacia 34 1991 187--209 http://fe.math.kobe-u.ac.jp/FE/Free/vol34/fe34-2-1.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE31-34-en_KML/fe34-187-209/fe34-187-209.pdf http://www.ams.org/mathscinet-getitem?mr=MR1130459 fe34-187-209 1991 Stability Switches in Linear Scalar Neutral Delay Equations FREEDMAN, H. I.; KUANG, Y. FREEDMAN, H. I.; KUANG, Y.
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