1. On the oscillation of solutions of a nonlinear equation of higher order;Kamenev;Differencial'nye Uravnenya,1971
2. On the maintenance of oscillations of nth order equations under the effect of a small forcing term;Kartsatos;J. Differential Equations,1971
3. Maintenance of oscillations under the effect of a periodic forcing term;Kartsatos,1972
4. On the oscillation of solutions of the equation (dmudtm) + a(t) |u |n sign u = 0;Kiguradze;Mat. Sb,1964
5. Oscillation of solutions of nonlinear differential delay equations of arbitrary order;Kusano;Hiroshima Math. J,1972