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Baxter, Paul N. W.; Connor, Joseph A.; Wallis, John D.; Povey, David C.; Powell, Anne K.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1992 , # 13 p. 1601 - 1606
Gillard, R. D.; Houghton, Roy P.; Tucker, John N.
Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1980 , p. 2102 - 2107