@article {1972876,
	title = {Managing knowledge in light of its evolution process: An empirical study on citation network-based patent classification},
	journal = {Journal of Management Information Systems},
	volume = {26},
	year = {2009},
	month = {2009},
	pages = {129-153},
	keywords = {BIS},
	author = {Li,Xin and Chen,Hshinchun and Zhang,Zhu and Li,Jiexun and Nunamaker,Jay F.}
}