Two papers on extremal problems in complex analysis [monographie] Titre d'origine: Osnovy teorii ėkstremalʹnykh zadach dliï¸ a︡ ogranichennykh analiticheskikh funktï¸ s︡i i ikh razlichnykh obobshcheni - Osnovy teorii ėkstremalʹnykh zadach dliï¸ a︡ ogranichennykh analiticheskikh funktï¸ s︡ii s dopolnitelʹn