2David C. Dubost,Michael J. Kaufman,Jeffrey A. Zimmerman,Michael J. Bogusky,Arthur B. Coddington,Steven M. Pitzenberger. Characterization of a Solid State Reaction Product from a Lyophilized Formulation of a Cyclic Heptapeptide. A Novel Example of an Excipient-Induced Oxidation[J] 1996,Pharmaceutical Research(12):1811~1814