Mathes; Sauermilch
Chemische Berichte, 1951 , vol. 84, p. 648,650
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Raschig G.m.b.H.
Patent: DE906333 , 1951 ;

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Raschig G.m.b.H.
Patent: US2620342 , 1952 ;

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Henze; Knowles
Journal of Organic Chemistry, 1954 , vol. 19, p. 1127,1129