1. ABYS(Always By Your Side): A virtual assistant for visually impaired persons;Sultan,2019
2. Cognitive interaction: Towards:cognitivity requirements for the design of virtual assistants;Bernard,2017
3. The Challenge from Digital Concierges;Waters,2015
4. Tech Groups Push ‘Chat Commerce’ to Western Shoppers;McGee,2019
5. A vision and speech enabled, customizable, virtual assistant for smart environments;Iannizzotto,2018