Shukla, Ranjana Vajpeyi Nee'; Misra, Krishna
Phytochemistry (Elsevier), 1981 , vol. 20, p. 339 - 340

Ciamician; Silber
Chemische Berichte, 1899 , vol. 32, p. 863
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Gazzetta Chimica Italiana, 1900 , vol. 30 II, p. 334,335