共 5 条
[3]
Getting patents and economic data to speak to each other: An ‘Algorithmic Links with Probabilities’ approach for joint analyses of patenting and economic activity[J] . Travis J. Lybbert,Nikolas J. Zolas. Research Policy . 2013
[4]
A vector space model for automatic indexing[J] . G. Salton,A. Wong,C. S. Yang. Communications of the ACM . 1975 (11)
[5]
Patent Statistics:Concordance IPC V8-NACE REV.2 .2 EUROSTAT. https://circabc.europa.eu/sd/a/d1475596-1568-408a-9191-426629047e31/2014-10-16-Final%20IPCNACE2 2014 pdf . 2015