Durrani, Aziz A.; Tyman, John H. P.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1980 , p. 1658 - 1666
Patel; Nargund
Journal of the University of Bombay, Science: Physical Sciences, Mathematics, Biological Sciences and Medicine, 1946 , vol. 15/3 A, p. 31,32