@article {1624,
	title = {A first principles study of the optical properties of BxCy single wall nanotubes},
	journal = { Carbon},
	volume = {45},
	year = {2007},
	pages = {1482-1491},
	author = {D. Jana and L. C. Chen and C. W. Chen and S. Chattopadhyay and K. H. Chen}
}
