Endres
Chemische Berichte, 1932 , vol. 65, p. 65,67
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Birckenbach; Sennewald
Justus Liebigs Annalen der Chemie, 1931 , vol. 489, p. 22
Chemische Berichte, 1932 , vol. 65, p. 550,551
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de Paolini
Gazzetta Chimica Italiana, 1930 , vol. 60, p. 704