1. “Functionalization of MWCNTs with atomic nitrogen”.  Ruelle B, Felten A, Ghijsen J, Drube W, Johnson RL, Liang D, Erni R, Van Tendeloo G, Sophie P, Dubois P, Godfroid T, Hecq M, Bittencourt C;, Micron 40, 85 (2009).   http://doi.org/10.1016/j.micron.2008.01.003