Sharma, Vedula M.; Seshu, K. V. Adi; Sekhar, V. Chandra; Madan, Sachin; Vishnu; Babu, P. Aravind; Krishna, C. Vamsee; Sreenu; Krishna, V. Ravi; Venkateswarlu; Rajagopal, Sriram; Ajaykumar; Kumar, T. Sravan
Bioorganic and Medicinal Chemistry Letters, 2004 , vol. 14, # 1 p. 67 - 71

Schoenberg; Iskander
Journal of the Chemical Society, 1942 , p. 90,92

Gist-Brocades N.V.
Patent: US4496720 A1, 1985 ;