http://www.ips-journal.eu/topics/european-union/article/show/no-more-penny-pinching-2076/
https://www.hesa.ac.uk/data-and-analysis/publications/finances-2015-16/introduction
https://www.imk-boeckler.de/download-proxy-for-faust/download-pdf?url=http%3A%2F%2F217.89.182.78%3A451%2Fabfrage_digi.fau%2Fp_imk_report_159e_2020.pdf%3Fprj%3Dhbs-abfrage%26ab_dm%3D1%26ab_zeig%3D8946%26ab_diginr%3D8482
https://www.boeckler.de/pdf/p_imk_report_152e_2020.pdf