Stevens; Stein
Journal of the American Chemical Society, 1940 , vol. 62, p. 1045,1046
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Research Corp. New York
Patent: US2218349 , 1939 ;

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Research Corp. New York
Patent: US2302671 , 1939 ;

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Research Corp. New York
Patent: US2314571 , 1939 ;

Morren
Journal de Pharmacie de Belgique, 1942 , vol. 1, p. 188

Koenig et al.
Acta Chimica Academiae Scientiarum Hungaricae, 1953 , vol. 3, p. 157,160