Ralston; Christensen
Industrial and Engineering Chemistry, 1937 , vol. 29, p. 194
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Armour and Co.
Patent: US2101559 , 1936 ;

Gilman; Ford
Iowa State College Journal of Science, 1939 , vol. 13, p. 141
Chem. Zentralbl., 1939 , vol. 110, # II p. 3062