[1] Chanturija, T. A., Kiguradze, I. T.: Asymptotic properties of nonautonomous ordinary differential equations. Nauka, Moscow, 1990. (Russian)
[2] Džurina, J.:
The oscillation of a differential equation of second order with deviating argument. Math. Slovaca 42 (1992), 317–324.
MR 1182961
[3] Džurina, J.:
Comparison theorems for nonlinear ordinary differential equations. Mat. Slovaca 42 (1992), 299–315.
MR 1182960
[4] Erbe, L.:
Oscillation criteria for second order nonlinear delay equation. Canad. Math. Bull 16 (1973), 49–56.
MR 0324173
[5] Hartmann, P.:
Ordinary differential equations. John Willey & Sons, New York–London–Sydney, 1964.
MR 0171038
[7] Ladde, G. S., Lakshmikhantam, V., Zhang, B. G.:
Oscillation theory of differential equations with deviating arguments. Dekker, New York, 1987.
MR 1017244
[8] Kusano, T., Naito, M.:
Oscillation criteria for general linear ordinary differential equations. Pacific J. Math. 92 (1981), 345–355.
MR 0618070
[9] Kusano, T., Naito, M.:
Comparison theorems for functional differential equations with deviating arguments. J. Math. Soc. Japan 3 (1981), 509–532.
MR 0620288
[10] Ohriska, J.:
On the oscillation of a linear differential equation of second order. Czech. Math. J. 39 (1989), 16–23.
MR 0983480 |
Zbl 0673.34043
[11] Ohriska, J.:
Oscillation of second order delay and ordinary differential equations. Czech. Math. J. 34 (1984), 107–112.
MR 0731983
[12] Swanson, C. A.:
Comparison and oscillation theory of linear differential equations. Acad. Press, New York-London, 1968.
MR 0463570 |
Zbl 0191.09904
[13] Shevelo, V. N., Varech, N. V.: On certain properties of solutions of differential equations with a delay. UMŽ 24 (1972). (Ukrainian)
[14] Tanaka, K.:
Asymptotic analysis of odd order ordinary differential equations. Hiroshima Math. J. 10 (1980), 391–408.
MR 0577867 |
Zbl 0453.34033
[15] Trench, W. F.:
Canonical forms and principal systems for general disconjugate equations. Trans. Amer. Math.Soc 189 (1974), 319–327.
MR 0330632 |
Zbl 0289.34051