J. J. Hickman, D. Ofer, C. Zou, M.S. Wrighton, P. E. Laibinis, and G. M. Whitesides. 1991. “Selective Functionalization of Gold Microstructures with Ferrocenyl Derivatives via Reaction with Thiols or Disulfides: Characterization by Electrochemistry and Auger Electron Spectroscopy.” J. Am. Chem. Soc., 113, Pp. 1128-1132.