
https://wiiw.ac.at/oeffentliche-investitionen-und-sozialstaat-perspektiven-der-budgetpolitik-im-kontext-von-energiekrise-klimawandel-und-eu-budgetregeln-dlp-6484.pdf

https://www.capgemini.com/consulting/wp-content/uploads/sites/30/2017/11/2017-egovernment-benchmark-insight1.pdf

https://www.projectnewsoasis.com/sites/default/files/2021-03/project-oasis-report-2021.pdf