Petrov, A. D.; Nikishin, G. I. Doklady Akad. Nauk. SSSR (russ.) (2), 1953 , vol. 93, p. 1049 - 1052 C. A., 1955 , p. 841 Full Text Show Details Gmelin Handbook: Si: MVol.C, 16, page 48 - 53