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Boedecker; Volk
Patent: US2062205 , 1936 ;
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Tschelinzew; Rodnewitsch
Zhurnal Prikladnoi Khimii (Sankt-Peterburg, Russian Federation), 1935 , vol. 8, p. 909
Chem. Zentralbl., 1936 , vol. 107, # I p. 2437
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Riedel-De Haen
Patent: FR751687 , 1933 ;