1. The steam engine and the commercialization of patents;Spear;World Patent Inf.,2008
2. Indexes of patent value: a systematic literature review and classification;Grimaldi;Knowl. Manag. Res. Pract.,2020
3. Patent quality: towards a systematic framework for analysis and measurement;Higham;Res. Pol.,2021
4. Estimates of the value of patent right in European countries during the post-1950 period;Schankerman;Econ. J.,1986