G.  Sakellariou, Ji, H., Mays, J. W., Hadjichristidis, N., and Baskaran, D., ?Controlled covalent functionalization of multiwalled carbon nanotubes using [4+2] cycloaddition of benzocyclobutenes?, Chemistry of Materials, vol. 19, no. 26, pp. 6370-6372, 2007.