1. Oscillation Theory for Difference and Functional Differential Equations;Agarwal,2000
2. Oscillation Theory for Second Order Linear, Half-linear, Superlinear and Sublinear Dynamic Equations;Agarwal,2002
3. Oscillation Theory for second Order Dynamic Equations;Agarwal,2003
4. On the oscillation of solutions of second order functional differential equations;Angelova;Math. Rep. Toyama Univ.,1982
5. On oscillation of solutions of forced functional differential equations of second order;Angelova;Math. Nachr.,1985