McGreal; Niederl; Niederl
Journal of the American Chemical Society, 1939 , vol. 61, p. 345
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Niederl
Patent: US2374949 , 1940 ;

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Easson et al.
Quarterly Journal of Pharmacy and Pharmacology, 1934 , vol. 7, p. 509,510, 511

Xerox Corporation
Patent: US4766255 A1, 1988 ;