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Leiden Univ, Ctr Sci & Technol Studies CWTS, Wassenaarseweg 62A, NL-2333 AL Leiden, Netherlands
Stellenbosch Univ, DST NRF Ctr Excellence Scientometr & Sci Technol, Stellenbosch, South Africa Leiden Univ, Ctr Sci & Technol Studies CWTS, Wassenaarseweg 62A, NL-2333 AL Leiden, Netherlands