1. On boundedness of solutions of impulsive systems;Ballinger;Nonlinear Stud.,1997
2. Permanence of population growth models with impulsive effects;Ballinger;Math. Comput. Modelling,1997
3. Existence and uniqueness results for impulsive delay differential equations;Ballinger;DCDIS,1999
4. Existence, uniqueness and boundedness results for impulsive delay differential equations;Ballinger;Appl. Anal.,2000
5. Stability and oscillations in Delay Differential Equations of Population Dynamics;Gopalsamy,1992