CHARACTERISTICS AND INTERRELATIONSHIP OF CONTROL PROBLEMS OF SINGLE ELECTRIC POWER INTERCONNECTED SYSTEMS IN THE SOVIET UNION ON DIFFERENT TIME AND AREA LEVELS Статья в журналеASTAKHOV YUN, VENIKOV VA, GOLOVITSYN BI, KOLPAKOVA AI, MELENT'EV LA, ROKOTYAN SS, RUDENKO YUN, SOVAAkademiya Nauk, Izvestiya, Energetika i Transport 1969Akademiya Nauk, Izvestiya, Energetika i Transport. No.6. P.17-23.