Baeyer
Chemische Berichte, 1876 , vol. 9, p. 1232
Justus Liebigs Annalen der Chemie, 1880 , vol. 202, p. 74,75
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Baeyer
Justus Liebigs Annalen der Chemie, 1880 , vol. 202, p. 56,63
Oparin, D.A.; Shalygina, V.A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. <8> 20, p. 934
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