MR1913684 L. A. V. CARVALHO, K. L. COOKE and L. A. C. LADEIRA L. A. V. CARVALHO, K. L. COOKE and L. A. C. LADEIRA Collapsible Backward Continuation and Oscillations in Retarded Differential Equations Funkcialaj Ekvacioj. Serio Internacia 45 2002 123--140 http://fe.math.kobe-u.ac.jp/FE/FullPapers/vol45/fe45-1-7.pdf http://www.ams.org/mathscinet-getitem?mr=MR1913684 45-123 2002 Collapsible Backward Continuation and Oscillations in Retarded Differential Equations L. A. V. CARVALHO, K. L. COOKE and L. A. C. LADEIRA L. A. V. CARVALHO, K. L. COOKE and L. A. C. LADEIRA 1 Burkill, J.; Burkill, H. A Second Course in Mathematical Analysis Cambridge Univ. Press 1970 MR0258550
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