1. Authenticated facsimile copy of the original manuscript. Schmidbaur, H.; private collection, Department Chemie, Technische Universität München, Germany.
2. Grohmann, A.; Schmidbaur, H.InComprehensive Organometallic Chemistry II;Abel, E. W., Stone, F. G. A., Wilkinson, G., Eds.Pergamon:Oxford, U.K., 1995; Vol.3, p1.
3. Gold—an introductory perspective