Anand; Venkataraman
Proceedings - Indian Academy of Sciences, Section A, 1947 , # 25 p. 438,441
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Canonica; Pelizzoni
Gazzetta Chimica Italiana, 1955 , vol. 85, p. 1007,1019, 1022
Habermann
Justus Liebigs Annalen der Chemie, 1875 , vol. 175, p. 63
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v. Kostanecki; Tambor
Monatshefte fuer Chemie, 1895 , vol. 16, p. 921 Anm.