Page 21 - Special Topic Session (STS) - Volume 2
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STS451 Yuji M.
            10.  Porter, A. L., and Rafols, I., "Is science becoming more interdisciplinary?
                 Measuring and mapping six research fields over time", Scientometrics,
                 Vol. 81, pp. 719–745, 2009
            11.  Clarivate Analytics, Essential Science Indicators Subject Areas
                 https://clarivate.com/products/essential-science-indicators/ (2019, 1
                 April)



































































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