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M.  Geloso,  Bull.  Soe.  Chim.  Fr.,  37,  491  (1925).
W.  Spring  and  G.  DeBoeek,  Bull.  Soc.  Chim.  Ft.,  48,  170  (1887).
P.B.  Ganguly  and  N.R.  Dhar,  J.  Phys.  Chem.,  26,  701  (1922).
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E.J.  Witzemann,  J.  Am.  Chem.  Soc.,  37,  1079  (1915).
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