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L Kivistik. "О НЕКОТОРЫХ ИТЕРАЦИОННЫХ МЕТОДАХ ДЛЯ РЕШЕНИЯ ОПЕРАТОРНЫХ УРАВНЕНИЙ В ПРОСТРАНСТВЕ ГИЛЬБЕРТА." Eesti NSV Teaduste Akadeemia Toimetised. Füüsika-, Matemaatika- ja Tehnikateaduste Seeria 9.3 (1960) 229