1. Survey on intelligent chatbots: state-of-the-art and future research directions;Almansor,2019
2. Amazon, 2019. Alexa Skill Kit: https://developer.amazon.com/en-GB/docs/alexa/ask-overviews/build-skills-with-the-alexa-skills-kit.html, accessed: 2019-11-24.
3. Impact of network performance on cloud speech recognition;Assefi,2015
4. An Experimental Evaluation of Apple Siri and Google Speech Recognition;Asseffi,2020
5. Evaluating Natural Language Understanding Services for Conversational Question Answering Systems;Braun,2017