Zhu, Z. P., Su, D. S., Lu, Y., Schlögl, R., Weinberg, G., & Liu, Z. Y. (2004). Molecular “Glass” Blowing: From Carbon Nanotubes to Carbon Nanobulbs. Advanced Materials, 16(5), 443-447. Retrieved from http://dx.doi.org/10.1002/adma.200306013.