Sammes, Michael P.; Leung, Christopher W. F.; Mak, Chi Keung; Katritzky, Alan R.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1981 , p. 1585 - 1590

Pathak, Ashish K.; Pathak, Vibha; Seitz, Lainne E.; Suling, William J.; Reynolds, Robert C.
Journal of Medicinal Chemistry, 2004 , vol. 47, # 1 p. 273 - 276