[2] M. K. Grammatikopoulos Y. G. Sficas, V. A. Staikos:
Oscillatory properties of strongly superlinear differential equations with deviating arguments. J. Math. Anal. Appl., 67 (1979), 171-187.
DOI 10.1016/0022-247X(79)90015-5 |
MR 0524471
[3] J. Ohriska:
Sufficient conditions for the oscillation of nth order nonlinear delay differential equation. Czech. Math. J., 30 (105) 1980, 490-497.
MR 0583628