1. Open access and academic imperialism
2. “2017 RELX Group annual report” (RELX Group, 2018), p. 17; www.relx.com/~/media/Files/R/RELX-Group/documents/reports/annual-reports/relx2017-annual-report.pdf.
3. “Springer Nature GmbH, Berlin, consolidated financial statements as at 31 December 2017” (Springer Nature, 2018); www.equitystory.com/Download/Companies/springernature/Annual%20Reports/2017_FinancialReportandAuditorOpinion_En.pdf.
4. “Wiley Fourth Quarter and Fiscal 2017 earnings report” (Wiley, 2017); https://s3.amazonaws.com/wiley-ecomm-prod-content/FY17+Q4+Earnings+Report.pdf.
5. D. S. Chawla , Nature 10.1038/d41586-019-00135-8 (2019).