Gray, Nancy M.; Cheng, Brian K.; Mick, Stephen J.; Lair, Cecelia M.; Contreras, Patricia C.
Journal of Medicinal Chemistry, 1989 , vol. 32, # 6 p. 1242 - 1248
Katritzky, Alan R.; Al-Omran, Fatima; Patel, Ranjan C.; Thind, Sukhpal S.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1980 , p. 1890 - 1894