Claude M. Tourné, Gilbert F. Tourné, S.A. Malik, T.J.R. Weakley
Triheteropolyanions containing copper(II), manganese(II), or manganese(III)
Journal of Inorganic and Nuclear Chemistry V.32, I. 12, Pages 3875-3890 (1970)
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http://dx.doi.org/10.1016/0022-1902(70)80566-8