N. E. Rodnishchev, A. Kh. Khirullin, “Necessary conditions for optimality of stochastic systems with uncontrollable flow of failures and constraints of the equality and inequality type”, Avtomat. i Telemekh., 2010, no. 11, 119–135; Autom. Remote Control, 71:11 (2010), 2367–2382
