@article {1968511,
	title = {Internal sequential innovations: How does interrelatedness affect patent renewal?},
	journal = {Research Policy},
	volume = {37},
	year = {2008},
	month = {2008},
	pages = {946-953},
	keywords = {Strategy \& Entrepreneurship},
	author = {Liu,K. and Arthurs,Jonathan and Cullen,J. and Alexander,R.}
}