Golberg, D., Mitome, M., Bando, Y., Tang, C. C., & Zhi, C. Y. (2007). Multi-walled boron nitride nanotubes composed of diverse cross-section and helix type shells. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 88(2), 347-352. doi:10.1007/s00339-007-3950-8
Golberg, D., Mitome, M., Bando, Y., Tang, C. C., & Zhi, C. Y. (2007). Multi-walled boron nitride nanotubes composed of diverse cross-section and helix type shells. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 88(2), 347-352. doi:10.1007/s00339-007-3950-8