[1] Kиrypaдзe И. T.:
O кoлeблeмocmu peщeкuй ypaвнeнuя $\frac{d^m u}{dt^m} + a(t) u^n \sgn u = 0. Maтeм. cбopник 65 (1964), 172-187.
MR 0173060
[2] Kигypaдзe И. T.: K вonpocy кoлeблeмocmu peшeнuй нeлuнeйныx дuффepeнцuaльныx ypaвнeнuй. Диф. ypaвнения 1, N 8 (1965) 995-1006.
[3] Kitamura Y., Kusano T.:
Nonlinear oscillation of higher - order functional differential equations with deviating arguments. J. Math. Anal. Appl. 77 (1980) 100-119.
MR 0591264 |
Zbl 0465.34044
[4] Kusano T., Naito M.:
Comparison theorems for functional differential equations with deviating arguments. J. Math. Soc. Japan (To appеar).
MR 0620288 |
Zbl 0494.34049
[5] Marušiak P.:
On oscillation of solutions of differential inequalities with retarded argument. Čas. pěst. mat. 104 (1979), 281-294.
MR 0543229
[6] Marušiak P., Werbowski J.: Oscillation and asymptotic behavior of solution of differential equations generated by delays. Fasc. Math. (To appеar).
[7] Philos Ch. G.:
Some results on the oscillatory and asymptotic behavior of the solutions of differential equations with deviating arguments. Arch. Math. 1. Ѕcripta Fac. Ѕci. Nat. UJEP Brunеnsis, XV. (1979) 19-36.
MR 0562108 |
Zbl 0435.34059
[8] Philos Ch. G.:
Oscillatory and asymptotic behavior of the bounded solutions of differential equations with deviating arguments. Hiroshima Math. J. 8 (1978), 31-48.
MR 0481368 |
Zbl 0378.34055
[9] Philos Ch. G., Ѕtaikos V. A.: Basic comparison results for the oscillatory and asymptotic behavior of differential equations with deviating arguments. Tеchnical Dеport. Univ. of Ioannina No 12 (1978), 1-29.
[10] Ѕficas Y. G.: On the oscillatory and asymptotic behavior of damped differential equations with retarded argument. Tеchnical Rеport Univ. of Ioannina, No 41 (1975) 1-25.