19　How to speed up your checkout process and reduce customer wait times (19 May 2016).
20　M Harris (26 October 2016) AI-powered body scanners could soon be inspecting you in public places.
21　J Beckett (25 January 2017) Getting out of line: AI lets shoppers avoid long waits at checkout.
22　E Brown (28 November 2017) AI: The ultimate personal shopper?
23　D Kirkpatrick (23 May 2017) Report: 45% of retailers expect to use AI within 3 years.