@article{Tan-2008-Physica,
	doi = {10.1016/j.physe.2007.10.058},
	year = {2008},
	volume = {40},
	pages = {2352-2359},
	author = {Tan, P. H. and Hasan, T. and Bonaccorso, F. and Scardaci, V. and Rozhin, A. G. and Milne, W. I. and Ferrari, A. C.},
	title = {Optical properties of nanotube bundles by photoluminescence excitation and absorption spectroscopy},
	journal = {Physica E}
}