Diss. Abstr., Diss. Rensselaer Polytech. Inst 1961, pp. 1 - 108 , vol. 22, p. 1030

Gmelin Handbook: B: B-Verb.13, 4.5.3.3, page 160 - 167
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McElroy, A. D.; Hunt, R. M.
Patent: US2996539 , 1962 ;