CASSELLA and Co
Chem. Zentralbl., 1910 , vol. 81, # I p. 783
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CASSELLA and Co
Chem. Zentralbl., 1911 , vol. 82, # I p. 360
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CASSELLA and Co.
Patent: DE218371 ;
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CASSELLA and Co.
Patent: DE230119 ;

CASSELLA and Co
Chem. Zentralbl., 1910 , vol. 81, # II p. 1422
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CASSELLA and Co.
Patent: DE227323 ;
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Proceedings - Indian Academy of Sciences, Section A, 1948 , # 28 p. 111,122