Jash, S. S.; Biswas, G. K.; Bhattacharyya, S. K.; Bhattacharyya, P.; Chakraborty, A.; Chowdhury, B. K.
Phytochemistry (Elsevier), 1992 , vol. 31, # 7 p. 2503 - 2506
Clancy, Michael G.; Hesabi, Massoud M.; Meth-Cohn, Otto
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1984 , # 3 p. 429 - 434