@article{Tang-2001-SST,
        doi = {10.1088/0268-1242/16/10/302},
	year = {2001},
	volume = {16},
	pages = {822-825},
	author = {Tang, Y. and Zheng, H. Z. and Yang, F. H. and Tan, P. H. and Li, Y. X. },
	title = {Capacitance-voltage characteristic as a trace of the exciton evolvement from spatially direct to indirect in quantum wells},
	journal = {Semicond. Sci. Technol.}
}