[1] W. J. Kim:
Nonoscillatory Solutions of Class of n-th Order Linear Differential Equations. J. Differential Equations 27, 19-27 (1978).
MR 0460792
[2] D. L. Lovelady:
On the Oscillatory Behavior of Bounded Solutions of Higher Order Differential Equations. J. Differential Equations, 19, 167-175 (1975).
MR 0382781 |
Zbl 0333.34030
[3] M. Švec: Мonotone Solution of Some Differential Equations. Colloquium Mathematicum, XVIII, 1967, 7-21.