1. Pew Research Center: Record shares of Americans now own smartphones, have home broadband. https://www.pewresearch.org/short-reads/2017/01/12/evolution-of-technology/. Accessed 11 June 2023
2. Howarth, J.: Time spent using smartphones (2023 Statistics). https://explodingtopics.com/blog/smartphone-usage-stats. Accessed 11 June 2023
3. Dominic, B.: Opinion | How the smartphone could help us manage our lives far better. https://www.livemint.com/opinion/columns/how-the-smartphone-could-help-us-manage-our-lives-far-better-11580318549883.html. Accessed 11 June 2023
4. Ranganathan, V.K., Siemionow, V., Sahgal, V., Yue, G.H.: Effects of aging on hand function. J. Am. Geriatr. Soc. 49, 1478–1484 (2001). https://doi.org/10.1046/j.1532-5415.2001.4911240.x
5. Wulf, L., Garschall, M., Klein, M., Tscheligi, M.: Young vs old – landscape vs portrait: a comparative study of touch gesture performance. J. Assist. Technol. 9, 136–146 (2015). https://doi.org/10.1108/JAT-10-2014-0029