Hexagonal honeycomb nanotubes with (a) zigzag and (b) armchair chiralities
Dulce C. Camacho-Mojica &amp; Florentino López-Urías
CC BY 4.0
<a rel="nofollow" class="external free" href="http://www.nature.com/articles/srep17902">http://www.nature.com/articles/srep17902</a>