Deshpande, A. R.; Joshi, U. K.; Paradkar, M. V., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 524 - 526
Hanmantgad, Shrikant S.; Kulkarni, Manohar V.; Patil, Vemanna D., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1986, vol. 25, p. 779 - 781