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Zakharkin, L. I.; Kalinin, V. N.; Snyakin, A. P. Doklady Akademii Nauk SSSR, 1970 , vol. 190/195, p. 970 - 973 Doklady Akademii Nauk SSSR, 1970 , vol. 195, p. 1357 - 1360 Full Text Show Details Gmelin Handbook: B: B-Verb.12, 5.1.14.3, page 219 - 220