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2. Apple: Human Interface Guidelines. https://developer.apple.com/design/human-interface-guidelines/
3. Arledge, C.P.: Filled-in vs. outline icons: the impact of icon style on usability. Ph.D. thesis, School of Information and Library Science of the University of North Carolina at Chapel Hill (2014)
4. Article 29 Data Protection Working Party: Opinion 15/2011 on the Definition of Consent WP187 (2011)
5. Article 29 Data Protection Working Party: Guidelines on transparency under regulation 2016/679, 17/EN WP260 rev.01 (2018)