[1] CHUANXI Q.-LADAS G.:
Oscillation in differential equations with positive and negative coefficients. Canad. Math. Bull. 33 (1990), 442-450.
MR 1091349
[2] CHUANXI Q.-LADAS G.:
Linearized oscillations for equations with positive and negative coefficients. Hiroshima Math. J. 20 (1990), 331-340.
MR 1063367 |
Zbl 0715.34125
[3] FARRELL K.-GROVE E. A.-LADAS G.:
Neutral delay differential equations with positive and negative coefficients. Appl. Anal. 27 (1988), 181-197.
MR 0922777 |
Zbl 0618.34063
[4] RUAN S.:
Oscillations for first-order neutral differential equations with variable coefficients. Bull. Austral. Math. Soc. 43 (1991), 147-152.
MR 1086728 |
Zbl 0719.34135
[5] YU J. S.:
Neutral differential equations with positive and negative coefficients. Acta. Math. Sinica 34 (1991), 517 523.
MR 1152147
[6] YU J. S.-WANG Z.:
Some further results on oscillation of neutral differential equations. Bull. Austral. Math. Soc. 46 (1992), 149-157.
MR 1170449 |
Zbl 0729.34051
[7] WEI J. J.:
Sufficient and necessary conditions for the oscillation of first order differential equations with deviating arguments and applications. Acta. Math. Sinica 32 (1989), 632-638.
MR 1046485