Deakin, S.; Scott, M.; Steele, B. D.
Z. Physik. Chem., 1909 , vol. 69, p. 123 - 135
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Gmelin Handbook: Ni: MVol.B3, 127, page 1045 - 1047
in water Addn. of excess satd. aq. K2C2O4 soln. to an aq. soln. of CoCl2; acidification with acetic acid;; dissolution of crude prod. in H2O; evapn. in vac. over H2SO4;;
Dey, A. K.; Bhattacharya, A. K.
Journal of the Indian Chemical Society, 1948 , vol. 25, p. 571 - 574
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Gmelin Handbook: Sn: MVol.C2, 14.18, page 224 - 225