Brown; Campbell
Journal of the Chemical Society, 1937 , p. 1699
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Levy; Campbell
Journal of the Chemical Society, 1939 , p. 1443
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Sprague; Johnson
Journal of the American Chemical Society, 1937 , vol. 59, p. 1837,1839

Roehm and Haas
Patent: US2147346 , 1937 ;

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Sprague; Johnson
Journal of the American Chemical Society, 1937 , vol. 59, p. 1837,1839