Influence of length on cytotoxicity of multi-walled carbon nanotubes against human acute monocytic leukemia cell line THP-1 <i>in vitro</i> and subcutaneous tissue of rats <i>in vivo</i>Yoshinori Sato, Kazuyuki Tohji, Kenichiro Shibata et al.|Molecular BioSystems|2005Cited by 356