Positive solutions of {$D\spn[r(t)D\spny(t)]=p(t)y(t-\tau (t))$}

MR0454257 Terry, Raymond D. Raymond D. TERRY Positive solutions of {$D\spn[r(t)D\spny(t)]=p(t)y(t-\tau (t))$} Funkcialaj Ekvacioj. Serio Internacia 20 1977 49--60 http://fe.math.kobe-u.ac.jp/FE/Free/vol20/fe20-1-5.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe20-049-060/fe20-049-060.pdf http://www.ams.org/mathscinet-getitem?mr=MR0454257 fe20-049-060 1977 Positive Solutions of $D^n[r(t)D^ny(t)]=p(t)y(t-\tau(t))$ Terry, Raymond D. Terry, Raymond D. 1 Ladas, G., Oscillatory effects of retarded actions, University of Rhode Island (U.S.A.), Technical Report No. 47, July 1974 MR0447746

2 Ladas, G.; Lakshmikantham, V.; Papadakis, J. S. Oscillations of higher-order retarded differential equations generated by the retarded argument Delay and Functional DifferentiaI Equations and their Applications, Academic Press, New York 1972 219-231 MR0387776 71 Cache/La/Ladas,Oscillations,*,1972,1973

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6 Wong, J. S. W. Second order oscillation with retarded argument 1971 NRL-MRC Conference, Academic Press, New York 1972 581-596 MR0425310 Cache/Wo/Wong,oscillation,*,1972,1973

7 Wong, P. K. On a class of nonlinear fourth order differential equations Ann. Mat. Pura Appl. 81 1969 331-346 MR0261102 100 Cache/Wo/Wong,nonlinear,Ann*,1969,1970