2021 VOLUME 41 - No. 2CONTENTS:THEORY OF CONTROLA.B. Sadigov, I.I. Mustafayev, G.N. Hajimatov, E.K. Gafarov. Description of a high-risk region as a control objectK.B. Mansimov, V.G. Rzayeva. The Pontryagin maximum principle as a necessary and sufficient optimality condition in a variable structure optimal control problemA.V. Karimova. Necessary optimality conditions in one discrete optimal control problemSh.Sh. Suleymanova. Optimality conditions in optimal control problems for a Gursa-Darboux system with a multipoint objective functionalR.O. Mastaliyev. Optimal control of a stochastic diffusion process with functional equality and inequality constraintsMODELING AND IDENTIFICATIONK.Sh. Mammadov, S.Y. Huseynov, A.H. Mammadova, I.I. Bakhshaliyeva. The problem of optimal selection of activities carried out in major constructionF.G. Rahimov, I.A. Ibadova, L.V. Guliyeva. On one family of first passage times of a Markov random walk described by an autoregressive process AR(1) for nonlinear boundariesR.A. Gasanov. Mathematical modeling of diffusion processes of contaminant mixtures in the aquatic environmentINFORMATION TECHNOLOGY AND SYSTEMST.A. Aliev, A.M. Abbasov, G.A. Guluyev, Аs.H. Rzayev, Y.G. Aliyev. Frequency converter-based monitoring, diagnostics and control system for artesian well pumpsN.V. Zakharchenko, M.M. Hajiyev, T.M. Mansurov, A.A. Nazarenko, N.S. Salmanov. Efficiency of transmission of discrete messages in a residue number system