Rutenber, Earl E.; De Voss, James J.; Hoffman, Lucas; Stroud, Robert M.; Lee, Kwan H.; Alvarez, Juan; McPhee, Fiona; Craik, Charles; Ortiz De Montellano, Paul R. Bioorganic and Medicinal Chemistry, 1997 , vol. 5, # 7 p. 1311 - 1320