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Mason; Block
Journal of the American Chemical Society, 1940 , vol. 62, p. 1443,1446
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Shell Devel. Co.
Patent: US2706194 , 1951 ;
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Jones; Wilson
Journal of the American Pharmaceutical Association (1912-1977), 1953 , vol. 42, p. 342
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Sen; Arora
Journal of the Indian Chemical Society, 1959 , vol. 36, p. 349,352