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Doklady Akademii Nauk SSSR, , vol. 154/159, p. 949 - 952 Doklady Akademii Nauk SSSR, , vol. 158, p. 656 - 659 Zhurnal Obshchei Khimii, , vol. 34, p. 1359 Zhurnal Obshchei Khimii, , vol. 34, p. 1356 - 1357