[1]Patent:US4634693,1987,A
[2]Patent:US4541956,1985,A
[1]Patent:US4634693,1987,A
[1]Patent:US4634693,1987,A
[2]Patent:US4541956,1985,A
[1]GmelinHandbuchderAnorganischenChemie,GmelinHandbook:Sn:Org.Verb.1,1.1.1.5.1,page94-98
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[1]InorganicChemistry,1988,vol.27,p.2887-2893