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[1]Petrow;Tschugunow[DokladyAkademiiNaukSSSR,1950,vol.73,p.323,325][Chem.Abstr.,1951,p.2921]
[2]Petrov,A.D.;Chugunov,V.S.[DokladyAkademiiNaukSSSR,1950,vol.73,p.323-326][C.A.,1951,p.2921][GmelinHandbuchderAnorganischenChemie,GmelinHandbook:Si:MVol.C,28,page86-90]