[1] A. G. Kartsatos:
On the maintenance of oscillations of n-th order equations under the effect of a small forcing term. J. Diff. Equations 10 (1971), 355-363.
MR 0288358 |
Zbl 0216.11504
[2] A. G. Kartsatos:
Maintenance of oscillations under the effect of a periodic forcing term. Proc. Аmer. Math. Soc. 33 (1972), З77-З8З.
MR 0330622 |
Zbl 0234.34040
[З] Y. Kitamura T. Kusano:
Nonlinear oscillation of a fourth order elliptic equation. J. Diff. Equations 30 (1978), 280-286.
MR 0513273
[4] Y. Kitamura T. Kusano:
Oscillation criteria for semilinear metaharmonic equations in exterior domains. Аrch. Rational Mech. Аnal. 75 (1980), 79-90.
MR 0592105
[5] M. Kulenović:
On oscillation of nonlinear partial differential inequalities. Radovi LXXIV (1983), 67-72.
MR 0756867
[6] T. Kusano M. Naito:
Oscillation criteria for a class of perturbed Schrödinger equations. Canad. Math. Bull. 25 (1982), 71-77.
MR 0657654
[7] E. Müller-Pfeiffer:
Über die Kneser-Konstante der Differential gleichung ( - Δ)'''u + g(x)u= 0. Аcta Math. Аcad. Sci. Hungar., 38 (1981), 139-150.
MR 0634576
[8] E. S. Noussair C. A. Swanson:
Oscillation theory for semilinear Schrödinger equations and inequalities. Proc. Roy. Soc. Еdinburgh Sect. А 75 (1976), 67-81.
MR 0442436
[9] G. O. Okikiolu:
Аspects of the theory of bounded integral operators in Lp-spaces. Аcademic Press, New York 1971.
MR 0445237
[10] Ch. G. Philos:
Oscillatory and asymptotic behavior of all solutions of differential equations with deviating arguments. Proc. Roy. Soc. Еdinburgh Sect. А, 81 (1978), 195-210.
MR 0516413
[11] B. Singh T. Kusano:
Forced oscillations in functional differential equations with deviating arguments. Аrch. Math. 1, Scripta Fac. Sci. Nat. UJЕP Brunensis, 19 (1983), 9-18.
MR 0724305
[12] W. F. Trench:
Canonical forms and principal systems for general disconjugate equations. Trans. Аmer. Math. Soc. 189(1974), 319-327.
MR 0330632 |
Zbl 0289.34051