“…A number of studies analyze interconnectivity among disciplines by assessing cross-disciplinary citations in journal articles (Small, 1999; van Leeuwen & Tijssen, 2000; Porter, Cohen, Roessner, & Perreault, 2007; Porter & Rafols, 2009), the co-classification of journal subfields (e.g., Tijssen, 1992; Morillo, Bordons, & Gómez, 2003), or co-wording in journal articles (Palmer, 1999). Industry convergence studies use similar methods; for example, Curran and colleagues (see Curran & Leker, 2009, 2011; Curran, Bröring, & Leker, 2010) define industry convergence as the rate of multi-assignation between industrial fields based on the International Patent Classification.…”