Krause; Renwanz
Chemische Berichte, 1932 , vol. 65, p. 782
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Johnson; Van Campen; Grummitt
Journal of the American Chemical Society, 1938 , vol. 60, p. 113
Steinkopf; Bauermeister
Justus Liebigs Annalen der Chemie, 1914 , vol. 403, p. 51
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Finzi
Gazzetta Chimica Italiana, 1915 , vol. 45 II, p. 283