Loet Leydesdorff, Duncan Kushnir, Ismael Rafols. Interactive overlay maps for US patent (USPTO) data based on International Patent Classification (IPC). Scientometrics, 98(3):1583-1599, 2014. [doi]
@article{LeydesdorffKR14, title = {Interactive overlay maps for US patent (USPTO) data based on International Patent Classification (IPC)}, author = {Loet Leydesdorff and Duncan Kushnir and Ismael Rafols}, year = {2014}, doi = {10.1007/s11192-012-0923-2}, url = {http://dx.doi.org/10.1007/s11192-012-0923-2}, researchr = {https://researchr.org/publication/LeydesdorffKR14}, cites = {0}, citedby = {0}, journal = {Scientometrics}, volume = {98}, number = {3}, pages = {1583-1599}, }