Necessary first- and second-order optimality conditions in problems of control described by a system of Volterra difference equations. - K. B. Mansimov; R. O. Mastaliev (Autom. Control. Comput. Sci., 2008)

Necessary Optimality Conditions for Singular Controls in Stochastic Goursat-Darboux Systems. - K. B. Mansimov; R. O. Mastaliev (Autom. Remote. Control., 2022)