1. Wikipedia, “Vertically aligned carbon nanotube arrays”, https://en.wikipedia.org/wiki/Vertically_aligned_carbon_nanotube_arrays#cite_note-23 (March 2019).
2. SBIR Vantablack®-S technical data brochure, http://www.sbir.com/Prod_Std_VANTABlack-S.asp (March 2019).
3. Surrey NanoSystems downloads, https://www.surreynanosystems.com/resources (March 2019).