Sources

Every source backing a fact on European Telecommunications Standards Institute's own page, deduplicated — the same source backing several facts appears once.

• https://dl.acm.org/doi/proceedings/10.1145/1085777 — https://dl.acm.org/doi/proceedings/10.1145/1085777
• https://dl.acm.org/doi/proceedings/10.1145/1613858 — https://dl.acm.org/doi/proceedings/10.1145/1613858
• https://github.com/sven-mayer/mobilehci-statistics — https://github.com/sven-mayer/mobilehci-statistics