OPTIMALITY CONDITIONS IN ABNORMAL EXTREMAL PROBLEMS ArticleArutyunov A.V.Systems and Control Letters. Том 27. 1996. С. 279-284
STATE CONSTRAINTS IN OPTIMAL CONTROL. THE DEGENERACY PHENOMENON ArticleArutyunov A.V., Aseev S.M.Systems and Control Letters. Том 26. 1995. С. 267-273