Wenzel, Thomas J.; Zaia, Joseph
Analytical Chemistry, 1987 , vol. 59, # 4 p. 562 - 567

Johnson; Sprague
Journal of the American Chemical Society, 1936 , vol. 58, p. 1349,1350
Journal of the American Chemical Society, 1937 , vol. 59, p. 1837
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Roehm and Haas
Patent: US2146744 , 1936 ;

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Sprague; Johnson
Journal of the American Chemical Society, 1937 , vol. 59, p. 1840

Sprague; Johnson
Journal of the American Chemical Society, 1937 , vol. 59, p. 1839
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Johnson; Sprague
Journal of the American Chemical Society, 1939 , vol. 61, p. 176,178