Hoffmann-La Roche
Patent: CH199682 , 1936 ;

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Hoffmann-La Roche
Patent: CH194682 , 1936 ;

Moore; Miller; Miller
Journal of the American Chemical Society, 1940 , vol. 62, p. 2097
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Adams; Long; Johanson
Journal of the American Chemical Society, 1939 , vol. 61, p. 2342,2344