May 23, 2023 Strumsky, D., J. Lobo, and S. van der Leeuw. 2012. Using patent technology codes to study technological change, Economics of Innovation and New Technology, 21:3, 267-286, DOI: 10.1080/10438599.2011.578709 Home » Strumsky, D., J. Lobo, and S. van der Leeuw. 2012. Using patent technology codes to study technological change, Economics of Innovation and New Technology, 21:3, 267-286, DOI: 10.1080/10438599.2011.578709