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Semenov, E. I.; Gerassimovsky, V. I.; Maksimova, N. V.; Andersen, S.; Petersen, O. V. Sorensenite, a New Sodium-Beryllium-Tin-Silicate from the Ilímaussaq Intrusion, South Greenland. Meddr Grønland 1965, 181, 23 pp..