Citation Frequency and the Value of Patented Inventions
通过对964项美、德专利的调查，发现专利被后续引用的次数与其经济价值估计正相关，全期维持的专利引用显著更高。
Through a survey, private economic value estimates were obtained on 964 inventions made in the United States and Germany and on which German patent renewal fees were paid to full-term expiration in 1995. A search of subsequent U.S. and German patents yielded counts of citations to those patents. Patents renewed to full-term were significantly more highly cited than patents allowed to expire before their full term. The higher an invention's economic value estimate was, the more the patent was subsequently cited. © 1999 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology