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Михаил Михайлович Фаддеев, Mikhail Mikhailovich Faddeev, Роман Григорьевич Штеренберг, Roman Grigor'evich Shterenberg. "О подобии некоторых дифференциальных операторов самосопряженным." Математические заметки 72.2 (2002) 292-302