The maximum principle in optimal control problems with concentrated and distributed delays in controls. Kharatishvili, G.; Tadumadze, T. — 1995 Georgian Mathematical Journal
Development of the theory of optimal systems with delayed arguments in Georgia. Kharatishvili, G.; Tadumadze, T. — 1997 Memoirs on Differential Equations and Mathematical Physics
Continuous dependence and differentiability of solutions with respect to initial data and right-hand side for differential equations with deviating argument. Kharatishvili, G.; Tadumadze, T.; Gorgodze, N. — 2000 Memoirs on Differential Equations and Mathematical Physics