Nonlinear photoluminescence from van Hove singularities in multiwalled carbon nanotubes Brennan, Margaret E. ; Coleman, Jonathan N. ; Drury, Anna ; Lahr, Bernd ; Kobayashi, Takeyuki ; Blau, Werner J. Abstract Publication: Optics Letters Pub Date: February 2003 DOI: 10.1364/OL.28.000266 Bibcode: 2003OptL...28..266B