MR0586276 Singh, Bhagat Bhagat SINGH Damped trajectories and slow oscillation in forced Li\'enard type functional equations Fako de l'Funkcialaj Ekvacioj Japana Matematika Societo. Funkcialaj Ekvaciog. Serio Internacia 23 1980 63--81 http://fe.math.kobe-u.ac.jp/FE/Free/vol23/fe23-1-5.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe23-063-081/fe23-063-081.pdf http://www.ams.org/mathscinet-getitem?mr=MR0586276 fe23-063-081 1980 Damped Trajectories and Slow Oscillation in Forced Lienard Type Functional Equations SINGH, Bhagat SINGH, Bhagat
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